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Supplier: HydraForce, Inc.
Description: A solenoid-operated, electrically-variabl e, pressure-compensated , spool-type, normally closed when de-energized, proportional, bi-directional, flow control valve. An internal compensator spool provides compensated flow across the proportional orifice regardless of flow
- Actuation: Electric
- Connection: Threaded
- Material: Steel
- Media Description: Hydraulic Fluid
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Supplier: Radwell International
Description: DIRECTIONAL CONTROL VALVE, BI. FREE 2 YEAR RADWELL WARRANTY
- Valve Type: Control Valves
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Supplier: Radwell International
Description: CONTROL VALVE, BI-DIRECTIONAL, 3/8 INCH PIPE, 145 MAX PSI. FREE 2 YEAR RADWELL WARRANTY
- Valve Type: Control Valves
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Supplier: Continental Hydraulics
Description: VSD 03M EXA HAZARDOUS DUTY SOLENOID ACTUATED, DIRECT OPERATED, DIRECTIONAL CONTROL VALVE EXPLOSION-PROOF Mounting Surface NFPA D03 (ISO 4401-03-02-0-03) Max Pressure 5000 PSI (350 bar) Max Flow Rate 20 gpm (76 l/min) CSA
- Actuation: Electric
- Agency / Standard: ISO
- Intrinsically Safe: Yes
- Media Description: Hydraulic Fluid
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Supplier: TrimTeck
Description: Pressure-assisted seating achieves bi-directional shut-off and low breakout torque. The OpDX™ butterfly control valve is a high performance rotary valve with an eccentric cammed disc that ensures accurate throttling. Its same flangless body (wafer) serves ANSI classes
- Actuation: Electro-pneumatic
- Connection: Bolt Flange
- Flow (Cv): 2.4 to 20200
- Material: Exotic Metal, Stainless Steel, Steel
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Supplier: DeZURIK, Inc.
Description: both industry valve dynamic performance standards and the accuracy levels of most competitive valves. The RCV is designed for high-capacity, bi-directional flow capability and includes four trim options for flexibility.
- Valve Type: Control Valves
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Supplier: HydraForce, Inc.
Description: A proportional solenoid-operated, 2-way, bi-directional, poppet-type, normally closed, screw-in hydraulic cartridge valve for low-leakage blocking and load-holding.
- Actuation: Electric
- Connection: Threaded
- Material: Steel
- Media Description: Hydraulic Fluid
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Supplier: Enfield Technologies
Description: motor and spool & sleeve combination ensure the valve ’ s ability to precisely follow a command signal. Features: 5/3 Bi-Directional Proportional Flow Control Linear Force Motor Infinitely Variable Valve Postioning Low Leakage Fast Shifting Time High Bandwidth
- Actuation: Pneumatic
- Connection: Threaded
- Flow (Cv): 0.3500
- Material: Aluminum, Stainless Steel, Steel
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Supplier: Enfield Technologies
Description: motor and spool & sleeve combination ensure the valve ’ s ability to precisely follow a command signal. Features: 5/3 Bi-Directional proportional flow control Linear force motor Infinitely variable valve postioning Low Leakage Fast Shifting Time High Bandwidth
- Actuation: Pneumatic
- Connection: Threaded
- Flow (Cv): 0.1300
- Material: Aluminum, Stainless Steel, Steel
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Supplier: Enfield Technologies
Description: electronics. The highly efficient bi directional motor driver only requires standard 24v single supply power Features: 5/3 Bi-Directional Proportional Flow Control Linear Force Motor Infinitely Variable Valve Positioning Low Hysteresis High Linearity On-Board
- Actuation: Pneumatic
- Connection: Threaded
- Flow (Cv): 1.1
- Material: Aluminum, Nylon - Polyamide, Stainless Steel, Steel, Other
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Supplier: Enfield Technologies
Description: electronics. The highly efficient bi directional motor driver only requires standard 24v single supply power Features: 5/3 Bi-Directional Proportional Flow Control Linear Force Motor Infinitely Variable Valve Positioning Low Hysteresis Fast Shifting Time High
- Actuation: Pneumatic
- Connection: Threaded
- Flow (Cv): 1.1
- Material: Aluminum, Nylon - Polyamide, Stainless Steel, Steel, Other
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Supplier: Radwell International
Description: DISCONTINUED BY MANUFACTURER, DIAPHRAGM ISOLATION VALVE, SV74 SERIES, 24 VDC COIL, 30 PSI MAX, BI-DIRECTIONAL, 2 WIRE, N.C. , ROUND. FREE 2 YEAR RADWELL WARRANTY
- Valve Type: Diaphragm Valves
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Supplier: DeZURIK, Inc.
Description: control Sleeve is the only wetted part, resulting in constant break-away torques Centerline closure Same face-to-face as gate, plug or ball valves Bi-directional drop-tight shut off Materials Of Construction Body: Cast
- Connection: Bolt Flange
- Material: Cast Iron
- Valve Type: Pinch Valves
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Supplier: DeZURIK, Inc.
Description: The Red Valve Series 5200 Control Valve offers maximum durability with precise control and virtually eliminates maintenance. The Series 5200 valve is designed in sizes 1” to 4”. A heavy-duty, rugged pinch mechanism positions the sleeve resulting in accurate flow
- Actuation: Electro-pneumatic
- Connection: Bolt Flange
- Material: Ductile Iron
- Valve Type: Pinch Valves
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Supplier: HydraCheck Inc.
Description: . Sealed to IP65. Accurate measurement of flow, pressure, and temperature. Built-in loading valve with “Interpass”™ safety system. Bi-directional for unrestricted connection and simplified testing. Portable and lightweight with an angled
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Supplier: Radwell International
Description: DISCONTINUED BY MANUFACTURER, FLOW MEASUREMENT VALVE, 1/2 INCH, BRONZE BODY, BI-DIRECTIONAL FLOW. FREE 2 YEAR RADWELL WARRANTY
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Supplier: DeZURIK, Inc.
Description: The electrically actuated Series 5200E Control Valve is a reliable, maintenance-free, cost-effective valve, designed for tough slurry and abrasive applications. There are no seats to grind, no stuffing boxes to repack, and no packing glands to adjust. The rugged, self-cleaning
- Actuation: Other
- Connection: Bolt Flange
- Material: Ductile Iron
- Valve Type: Pinch Valves
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Supplier: Pneumadyne, Inc.
Description: fundamental difference between the two is the needle valve controls flow in both directions (bi-directional) and the flow control valve controls flow in only one direction (allowing free flow in the opposite direction). In both the flow control and
- Connection: Threaded
- Flow (Cv): 0.0900
- Material: Brass / Bronze, Exotic Metal, Stainless Steel
- Media Description: Air, Compressed Air, Water
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Supplier: Pneumadyne, Inc.
Description: fundamental difference between the two is the needle valve controls flow in both directions (bi-directional) and the flow control valve controls flow in only one direction (allowing free flow in the opposite direction). In both the flow control and
- Connection: Threaded
- Flow (Cv): 0.0900
- Material: Brass / Bronze, Exotic Metal, Stainless Steel
- Media Description: Air, Compressed Air, Water
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Supplier: Valcor Engineering Corporation
Description: are designed and manufactured according to customer specifications and following the guidelines of ASME B&V codes. Application This valve is engineered for liquid or gas applications in the Nuclear industry. Typical applications are feed water control systems, dump lines, make
- Actuation: Electric
- Connection: Threaded
- Flow (Cv): 1 to 50
- Media Description: Water, Gas
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Description: Construction: Made from high-quality materials, such as cast iron, cast steel, stainless steel, or alloy steel, the DIN Gate Valve with Bellows is built to withstand harsh industrial environments and provide a long service life. Bi-directional Flow: This gate valve is designed
- Valve Type: Bellows Valves, Directional Valves, Gate / Knife Valves
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Supplier: Continental Hydraulics
Description: bi-directional flow when energized. Both the A and B work ports incorporate a 2-way, 2-position bi-directional, normally closed poppet type solenoid valve. Energizing the solenoid will allow full flow to the system.
- Agency / Standard: ISO
- Media Description: Hydraulic Fluid
- Number of Ports/Ways: 2
- Pressure Rating: 5000 psi
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Supplier: OPW Engineered Systems
Description: A wide range of applications from vacuum to very high pressure service, and from low to very high temperature service Suitable for any severe process lines Excellent control characteristics that allow throttle control of flows Bubble-tight shut-off capability Optional "Blow-Out Proof
- Actuation: Manual / Hand, Mechanical Device, Electric, Pneumatic
- Flow (Cv): 2.1 to 21000
- Media: Powder / Solids, Other
- Pressure Rating: 75 to 285 psi
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Supplier: SVF Flow Controls, Inc.
Description: Internally anodized body for corrosion resistance Available in Spring Return (QS) and Double Acting (QD) models ISO 5211 bottom flange for valve automation NAMUR output drive for installation of limit switches and positioners Bi-Directional Stroke Adjustment 1/4” NPT air inlet manifold
- Actuation Method: Pneumatic
- Actuator Torque: 53 to 23767 In-lbs
- Air Supply Pressure: 40 to 120 psi
- Control Signal Input: Pressure Control Signal
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Supplier: Asahi/America, Inc.
Description: benefit of a bi-directional actuator is precise flow control, as the actuator is not required to travel the full stroke to begin the reverse stroke.
- Media Temperature: 150 F
- Valve Size: 0.5000 to 4 inch
- Valve Type: Ball Valves
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Supplier: Asahi/America, Inc.
Description: benefit of a bi-directional actuator is precise flow control, as the actuator is not required to travel the full stroke to begin the reverse stroke.
- Media Temperature: 150 F
- Valve Size: 0.5000 to 3 inch
- Valve Type: Ball Valves
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Supplier: NOSHOK, Inc.
Description: rating (@ 200°F maximum) Replaceable Delrin® seat and straight through porting for bi-directional, high capacity flow and easy roddable cleaning PCTFE or PEEK soft seat optional Blow-out proof stem provides a secondary stem seal in the full open position
- Actuation: Manual / Hand
- Flow (Cv): 0.0 to 0.7600
- Number of Ports/Ways: 2
- Pressure Rating: 6000 psi
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Supplier: Gemu Valves
Description: is also a connection for a leakage detection sensor (3). The union nuts can be either in PVDF-HP or PFA-HP (4). C67 has a standard optical position indicator (5). Advantages Proven actuator reliability High Purity Design High Cv values Bi-directional
- Actuation: Manual / Hand, Pneumatic
- Connection: Clamp Flange
- Media Temperature: 194 F
- Pressure Rating: 87.02 psi
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Supplier: HydraForce, Inc.
Description: A screw-in, cartridge-style, pressure-compensated , fixed orifice, bi-directional, restrictive-type flow control valve.
- Actuation: Pilot Operated
- Number of Ports/Ways: 2
- Pressure Rating: 3500 psi
- Valve Type: Cartridge / Manifold Valves
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Supplier: Parker Sporlan Division
Description: , engineered specifically for systems with a wide range of operating conditions and may be applied on bi-directional applications. BQ valves are supplied as three individual component parts: the thermostatic element, the valve body, and the replaceable cartridge or orifice. The
- Media: Other
- Valve Type: Other
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Supplier: Parker Sporlan Division
Description: , engineered specifically for systems with a wide range of operating conditions and may be applied on bi-directional applications. BQ valves are supplied as three individual component parts: the thermostatic element, the valve body, and the replaceable cartridge or orifice. The
- Media: Other
- Pressure Rating: 450 psi
- Valve Size: 0.3750 inch
- Valve Type: Other
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Supplier: Parker Sporlan Division
Description: , engineered specifically for systems with a wide range of operating conditions and may be applied on bi-directional applications. BQ valves are supplied as three individual component parts: the thermostatic element, the valve body, and the replaceable cartridge or orifice. The
- Media: Other
- Pressure Rating: 450 psi
- Valve Size: 0.3750 inch
- Valve Type: Other
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Supplier: Parker Sporlan Division
Description: , engineered specifically for systems with a wide range of operating conditions and may be applied on bi-directional applications. BQ valves are supplied as three individual component parts: the thermostatic element, the valve body, and the replaceable cartridge or orifice. The
- Media: Other
- Pressure Rating: 450 psi
- Valve Size: 0.3750 inch
- Valve Type: Other
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Supplier: HydraForce, Inc.
Description: A manually adjustable, pressure-compensated , bi-directional flow control valve. An internal compensator spool provides compensated flow across the proportional orifice regardless of flow direction.
- Actuation: Manual / Hand
- Number of Ports/Ways: 2
- Pressure Rating: 3500 psi
- Valve Size: 0.6250 to 1 inch
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Supplier: Bray Commercial
Description: These Bray direct-coupled spring return rotary electric actuators are designed for On/Off, Tri-State, or Modulating control of building HVAC valves and dampers. These actuators are used in constant or variable air volume installations for the control of return air, mixed air,
- AC Phase: Single Phase
- AC Voltage: 24 volts
- Actuation Method: Electric
- Actuator Torque: 140 In-lbs
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Supplier: Bray Commercial
Description: . Features: Bi-Directional, Fail-safe Spring Return Four Control Input Types Wide Range Resistive Input On/Off Control Output Position Feedback
- AC Phase: Single Phase
- AC Voltage: 24 to 230 volts
- Actuation Method: Electric
- Actuator Torque: 180 In-lbs
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Supplier: Bray Commercial
Description: The D-Series is a direct-mount line of electric actuators that operates on 24V AC or DC power and is available for use with floating, proportional, or resistive controllers. These bi-directional actuators do not require a damper linkage, and are easily installed on a round shaft up to a 3/4
- AC Phase: Single Phase
- AC Voltage: 20 to 30 volts
- Actuation Method: Electric
- Actuator Torque: 280 In-lbs
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Supplier: Bray Commercial
Description: The DCS-62 Series is a direct-mount, spring return line of electric actuators that operates on 24 VAC or VDC power and is available for use with floating, on/off, or proportional controllers. A 120 VAC on/off model is also available. These bi-directional actuators do not require a damper
- AC Phase: Single Phase
- AC Voltage: 20 to 120 volts
- Actuation Method: Electric
- Actuator Torque: 62 In-lbs
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Supplier: Rotork plc
Description: LA-2400 linear actuators for reliable positioning of dampers, combustion controls, gates, diverters, hydraulic variable speed drives, or other linear positioning applications. AC or DC powered, self-contained, bi-directional and internally geared to produce up to 6,672 N (1,500 lbf)
- AC Phase: Single Phase, Three Phase
- Actuation Method: Electric
- Operation: Modulating
- Valve Motion: Linear Motion Valve
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Supplier: Rotork plc
Description: LA-2500 linear actuators for reliable positioning of dampers, combustion controls, gates, diverters, hydraulic variable speed drives, or other linear positioning applications. AC powered, self-contained, bi-directional and internally geared to produce up to 7,117 N (1,600 lbf) thrust.
- AC Phase: Single Phase, Three Phase
- Actuation Method: Electric
- Operation: Modulating
- Valve Motion: Linear Motion Valve
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Supplier: Littelfuse, Inc.
Description: This 0.5 A bi-directional solid state switch series offers direct interface to microprocessor drivers in a SOT-23 package for low power AC switching applications such as e-valve and AC solenoid drive. The die voltage blocking junctions are glass-passivated to ensure long term
- IH: 5 mA
- IT(RMS): 0.5000 amps
- VTM: 1.55 volts
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Description: motors and single-acting cylinders, as well as for use with multi-function circuits through external valving. Bi-directional hydraulic power units are commonly used to operate double-acting cylinders and reversible motors. Markets: • Industrial • Medical
- Flow: 1.4 GPM
- Operating Pressure: 3495 psi
- Power Source: Electric Motor
- Total Power: 1 HP
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Supplier: CIRCOR Energy
Description: (subject to pressure limitations), so your pipeline can continue to operate Bi-directional or Omni-directional trigger mechanism Can be used with Foam Pigs, metal Bodied Pigs, Polyurethane Pigs and Spheres
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Supplier: Dorner Manufacturing Corp.
Description: rollers on 32 mm (1.26 in) centers Load capacity: up to 18.2 kg (40 lbs) per pallet Up to 37 m/min (121 ft/min) Driven rollers Brushless DC gearmotor and controller Bi-directional and reversing Lift and transfer 240 mm wide and smaller include
- Conveyor Type: Pallet / Puck Conveyor
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Supplier: Dorner Manufacturing Corp.
Description: Brushless DC gearmotor and controller Bi-directional and reversing 63 mm diameter pneumatic lift cylinder provided for pallet widths up to 400 mm. 80 mm diameter pneumatic lift cylinder provided for pallet widths 480 to 800 mm. Includes air fittings for
- Conveyor Type: Pallet / Puck Conveyor
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Supplier: PR electronics
Description: Application 9107B is a 1- or 2-channel isolated 1:1 driver barrier for intrinsic safety applications. Operation and drive control of I/P converters, valves and indicators mounted in the hazardous area. Operation of HART® devices is possible as the
- Agency Approvals: ATEX, FM Approval, UL Listed, Other
- Barrier Type: Galvanic Isolator
- Maximum Open Circuit Voltage (VOC): 32 volts
- Maximum Short Circuit Current (ISC): 1000 milliamps
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Supplier: U.S. Plastic Corporation
Description: Compact, variable-flow, bi-directional, self-priming peristaltic pumps offer precise flow deliveries. Ideal for use with conductivity flow-thru cells, liquid chromatography, collecting fractions, circulating fluids or buffers in baths, and moving corrosive materials. They provide outstanding
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Supplier: Terra Universal, Inc.
Description: Economical turnkey solutions for a wide range of cleaning and processing requirements Versatile deck configurations accommodate up to 7 sinks, rinsers, and other processing modules (deeper decks available for up to 14 modules) Bi-directional exhaust system safely removes
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Supplier: Terra Universal, Inc.
Description: Economical turnkey solutions for a wide range of cleaning and processing requirements Versatile deck configurations accommodate up to 7 sinks, rinsers, and other processing modules (deeper decks available for up to 14 modules) Bi-directional exhaust system safely removes
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Description: durability and reliable pressure control. A closed circuit design makes GOLD CUP series pumps and motors ideal for bi-directional function and eliminates energy losses associated with circuit valving. GOLD CUP's high power-to-weight ratio, compact package, and flexibility in
- Housing Material: Cast Iron
- Maximum Discharge Pressure: 5000 psi
- Maximum Discharge Flow: 238 GPM
- Media Temperature: -40 to 203 F
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Supplier: Cole-Parmer
Description: several different tubing sizes to acheive flow rates from 0.005 to 600 mL/min.
Compact, variable-flow, bi-directional, self-priming, peristaltic pumps offer precise flow deliveries. Ideal for use with conductivity flow-thru cells, liquid chromatography, collecting fractions, p- Maximum Discharge Flow: 0.1585 GPM
- Power Source: DC Powered
- Pump Type: Peristaltic Pumps
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Supplier: Cole-Parmer
Description: several different tubing sizes to acheive flow rates from 0.005 to 600 mL/min.
Compact, variable-flow, bi-directional, self-priming, peristaltic pumps offer precise flow deliveries. Ideal for use with conductivity flow-thru cells, liquid chromatography, collecting fractions, p- Maximum Discharge Flow: 0.0022 GPM
- Power Source: DC Powered
- Pump Type: Peristaltic Pumps
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Supplier: Cole-Parmer
Description: several different tubing sizes to acheive flow rates from 0.005 to 600 mL/min.
Compact, variable-flow, bi-directional, self-priming, peristaltic pumps offer precise flow deliveries. Ideal for use with conductivity flow-thru cells, liquid chromatography, collecting fractions, p- Maximum Discharge Flow: 4.76E-4 GPM
- Power Source: DC Powered
- Pump Type: Peristaltic Pumps
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Supplier: Cole-Parmer
Description: several different tubing sizes to acheive flow rates from 0.005 to 600 mL/min.
Compact, variable-flow, bi-directional, self-priming, peristaltic pumps offer precise flow deliveries. Ideal for use with conductivity flow-thru cells, liquid chromatography, collecting fractions, p- Maximum Discharge Flow: 0.0225 GPM
- Power Source: DC Powered
- Pump Type: Peristaltic Pumps
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Supplier: GEEPLUS Inc.
Description: lens and mirror positioning systems. One big advantage e.g. over proportional solenoids is the extremely small hysteresis which make Voice Coil Actuators ideally suited for applications requiring well controllable bi-directional movement. The VM series of Voice Coil Motors are designed
- Continuous Power: 12 watts
- Device Type: Linear Actuator
- Force Constant (KF): 1.12 to 2.7 lb/amp
- Linear Stroke: 0.3543 inch
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Supplier: GEEPLUS Inc.
Description: lens and mirror positioning systems. One big advantage e.g. over proportional solenoids is the extremely small hysteresis which make Voice Coil Actuators ideally suited for applications requiring well controllable bi-directional movement. The VM series of Voice Coil Motors are designed
- Continuous Power: 42 watts
- Device Type: Linear Actuator
- Force Constant (KF): 4.95 to 10.79 lb/amp
- Linear Stroke: 0.5512 inch
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Supplier: GEEPLUS Inc.
Description: lens and mirror positioning systems. One big advantage e.g. over proportional solenoids is the extremely small hysteresis which make Voice Coil Actuators ideally suited for applications requiring well controllable bi-directional movement. The VM series of Voice Coil Motors are designed
- Continuous Power: 28 watts
- Device Type: Linear Actuator
- Force Constant (KF): 3.15 to 12.81 lb/amp
- Linear Stroke: 0.4724 inch
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Supplier: Traceable® Products
Description: Compact, variable-flow, bi-directional, self-priming, peristaltic pumps offer precise flow deliveries. Ideal for use with conductivity flow-thru cells, liquid chromatography, collecting fractions, pH/circulating fluids or buffers in baths, and moving corrosive materials. They provide
- Housing Material: Plastic
- Maximum Discharge Flow: 4.76E-4 GPM
- Media Temperature: 500 F
- Power Source: AC Powered
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The Lee Company makes three different kinds of Flow Controls: Restrictor Checks Directional Flow Controls Flow Regulators Restrictor Check Valves Lee Restrictor (read more)
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With the features of much larger control modules, these PVMs include a large current range, a minimal width of just 12 mm, and the capability to have two single coil valves or one dual-coil valve controlled either unidirectionally or bi-directionally, offering high repeatability. It also (read more)
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performance and durability, these valves are capable of bi-directional flow at fully rated pressures in a variety of water and wastewater treatment applications. Learn more: https://lnkd.in/gY8y44MA (read more)
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. Eccentric plug valves are available in sizes from .5 to 72 inches (15-1800 mm) with a temperature range of up to 300 degrees Fahrenheit (150 degrees Celsius). They are available with resilient plug facings for drip tight bi-directional shutoff, or metal plugs that provide shutoff per ANSI/FCI 70 (read more)
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Shuttle Valves In both types of detented shuttle valves, the poppet is mechanically latched to close off either the A or B port. This is typical of brake systems where bi-directional flow may be required between B and C. A zero leak version of the (read more)
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Knife Gate Valves produce no discharge of process media to atmosphere and feature a one-piece, cast-in-place liner that provides bi-directional, drip-tight shutoff to either 150 or 250 psi (1030 or 1720 kPa) CWP. All wetted surfaces of the body are lined with urethane. DeZURIK KUL Valves have been (read more)
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-
The Ridgway Pneuflo
The ground drive of the unit was driven by an hydraulic motor (Char-lynn model 309 101 1011 007), directly coupled to the transfer case and connected to a bi - directional control valve to give forward and reverse motion and braking.
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http://dspace.mit.edu/bitstream/handle/1721.1/43326/37159910-MIT.pdf?sequence=2
The third feature was the bi - directional flow control valve for the auger.
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A simple modulation scheme for a three-phase direct matrix converter
One alternative to reduce the size of the drive is the Direct Matrix Converter (DMC), where the two stage back-to-back connection system is replaced by an array of bi - directional controlled power valves [1], [2].
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Predictive control of source and load currents in a direct matrix converter
One alternative for this is the Direct Matrix Converter (DMC), where the back-to-back connection is replaced by an array of bi - directional controlled power valves [1], Fig. 1.
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Predictive control of the Indirect Matrix Converter with active damping
HE Conventional Matrix Converter (CMC) is a direct conversion topology based on bi - directional controlled power valves .
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High-authority smart material integrated electric actuator
Further, electronic valve control provides bi - directional pumping action, eliminating the servovalve typically used to port pressurized fluids.
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Pipeline Network Optimization - Application of Genetic Algorithm Methodologies
Two control valves were bi - directional flow valves.
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https://dspace.lib.cranfield.ac.uk/bitstream/1826/7632/1/Feasibility_of_High_Frequency_AC_Power-2011.pdf
These valves control the bi - directional .
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Planning and Execution of Highly Overbalanced Completions from a Floating Rig: The Ursa-Princess Waterflood Project
To avoid damage to the completion and provide continued primary well control, a bi - directional Fluid Loss Control Valve (FLCV) was placed below the gravelpack packer assembly, to be closed while pulling out of the hole with the service tool string.
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http://www05.abb.com/global/scot/scot271.nsf/veritydisplay/976a36b764246f12c125782900577d7a/$file/abb%20review%202-2010_72dpi.pdf
6 A bi - directional control thyristor (BCT) valve .