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Supplier: Radwell International
Description: DISCONTINUED BY MANUFACTURER, BUTTERFLY VALVE DISC, STEM 2.0 IM, 200BVP, 316L. FREE 2 YEAR RADWELL WARRANTY
- Valve Type: Butterfly Valves
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Supplier: DeZURIK, Inc.
Description: DeZURIK AWWA Butterfly Valves meet the requirements of AWWA C504 and C516 standards. They are used for shutoff on clean water and gases. Offset disc design, corrosion resistant shaft, stainless steel disc edge, and self-compensating shaft seals are features on all DeZURIK AWWA
- Valve Type: Butterfly Valves
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Supplier: G.I.E. Inc.
Description: FEATURES1. Face to Face dimensions as per as perANSI B16.10150# Narrow / EN558-2 Series 20.2. Suitable for mounting onANSI B16.5 150# flanges3. Testing as perAPI 598 / EN12266-14. Stem connection and integrated actuator mountingflange as perISO5211.5. Spring loaded stem seal.6. Elastomeric
- Actuation: Manual / Hand, Pneumatic
- Agency / Standard: API, ISO
- Connection: Bolt Flange
- Material of Construction: Cast Iron
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Supplier: G.I.E. Inc.
Description: FEATURES1. Face to Face dimensions as per as perANSI B16.10150# Narrow / EN558-2 Series 20.2. Suitable for mounting betweenANSI B16.5 150#flanges3. Testing as perAPI 598 / EN12266-14. Stem connection and integrated actuator mountingflange as perISO5211.5. Spring loaded stem seal.6.
- Actuation: Manual / Hand, Pneumatic
- Agency / Standard: API, ISO
- Material of Construction: Cast Iron
- Media Description: Water
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Supplier: DeZURIK, Inc.
Description: -US Resilient Seated Butterfly Valves feature a one-piece body; one-piece shaft and high-performance resilient seats made of EPDM or NBR. The uninterrupted seat design provides bi-directional shutoff to the full rating of the valve in 2-14? sizes. BOS-US sizes 16-20” shut
- Valve Type: Butterfly Valves
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Supplier: Grinnell
Description: The GRINNELL Model B333 Large Diameter Butterfly Valve provides efficient control of fluid flow in piping systems. It is a grooved-end bubble tight shut-off valve with end-to-end dimensions that meet MSS SP-67, Table 4 and a mounting pad that meets ISO 5211 for the mounting of
- Actuation: Manual / Hand
- Material of Construction: Ductile Iron
- Media Temperature: -30 to 200 F
- Pressure Rating: 300 psi
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Supplier: Bray Commercial
Description: butterfly valves are 100% factory tested for bubble tight shut off and low seating/unseating torque. NY and AB Series valves are available in 2-way and 3-way configurations in sizes from 2” to 20”. Actuators include industrial electric, commercial electric, high pressure
- Actuation: Electric, Pneumatic
- Connection: Bolt Flange
- Flow (Cv): 61 to 22339
- Material of Construction: Cast Iron
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Supplier: Bray Commercial
Description: butterfly valves are 100% factory tested for bubble tight shut off and low seating/unseating torque. NY and AB Series valves are available in 2-way and 3-way configurations in sizes from 2” to 20”. Actuators include industrial electric, commercial electric, high pressure
- Actuation: Electric, Pneumatic
- Connection: Bolt Flange
- Flow (Cv): 61 to 22339
- Material of Construction: Cast Iron
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Supplier: Media Valve, Inc.
Description: The Mosites A20 Butterfly Valve was developed in response to market demand for a high cycle butterfly valve. Reduced torque and low profile disc increases the A20 cycle capabilities and economizes actuation cost. Uniquely suited for applications involving
- Flow (Cv): 3 to 429
- Valve Size: 2.99 inch
- Valve Type: Butterfly Valves
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Supplier: Media Valve, Inc.
Description: The Mosites C10 Butterfly Valve, which is fully elastomer lined, is in use throughout the world in a wide range of critical service applications. The control of water, chemicals, air, slurries, and vapors to 150 psi bubble-tight shut off can be achieved with the Mosites
- Flow (Cv): 221 to 21600
- Valve Size: 18.5 inch
- Valve Type: Butterfly Valves
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Supplier: Mueller Company
Description: • CORROSION RESISTANT SHAFT - is constucted of stainless steel. Two-piece, stub-type shafts are sized per AWWA Standard C504, Class 150B or Class 250. • CHEVRON V-TYPE PACKING - is self-adjusting packing in top trunnion of valve body where shaft protrudes. • STRONG
- Connection: Bolt Flange
- Material of Construction: Cast Iron
- Media Description: Water
- Pressure Rating: 250 psi
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Supplier: Belimo Americas
Description: Butterfly Valve,20",2 Way,27908 Cv,Gear Operators
- Flow (Cv): 43116
- Pressure Rating: 200 psi
- Valve Size: 24 inch
- Valve Type: Butterfly Valves
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Supplier: Belimo Americas
Description: Butterfly Valve,14",2-Way,5702 Cv,w/ Gear Operators
- Flow (Cv): 5702
- Pressure Rating: 0.0 psi
- Valve Size: 14 inch
- Valve Type: Butterfly Valves
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Supplier: McWane Plant and Industrial
Description: Features & Benefits High-Performance Butterfly Valves Pressure Class: ANSI 150 and ANSI 300 End Connection: Wafer and Lugged Style Conforms to: ASME B16.20 API 607 4th Ed.; ASME B16.34 API 609 5th Ed.; ASME B16.5 MSS SP-6; ASME B31.1 MSS SP-25 The Tri
- Valve Type: Butterfly Valves
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Supplier: Media Valve, Inc.
Description: The Mosites C10 Butterfly Valve, which is fully elastomer lined, is in use throughout the world in a wide range of critical service applications. The control of water, chemicals, air, slurries, and vapors to 150 psi bubble-tight shut off can be achieved with the Mosites
- Flow (Cv): 221 to 21600
- Valve Size: 18.46 inch
- Valve Type: Butterfly Valves
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Supplier: KSB AG
Description: Design Centered disc butterfly valve with elastomer liner. With lever, manual gearbox, pneumatic, electric or hydraulic actuator. Semi-lug type body (T2) or fulllug type body (T4). Body types T2 and T4 are suitable for downstream dismantling and dead-end service with counterflange
- Actuation: Manual / Hand, Electric, Electro-hydraulic, Pneumatic
- Agency / Standard: ISO
- Connection: Threaded, Bolt Flange
- Material of Construction: Cast Iron, Steel
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Supplier: Belimo Americas
Description: Butterfly Valve,20",2 Way,14420 Cv,Gear Operators
- Flow (Cv): 14420
- Pressure Rating: 285 psi
- Valve Size: 20 inch
- Valve Type: Butterfly Valves
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Supplier: Belimo Americas
Description: Butterfly Valve,20",2 Way,10658 Cv,Gear Operators
- Flow (Cv): 10658
- Pressure Rating: 740 psi
- Valve Size: 20 inch
- Valve Type: Butterfly Valves
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Supplier: KSB AG
Description: Design Centered disc butterfly valve with elastomer liner. With lever, manual gearbox, pneumatic, electric or hydraulic actuator. Wafer typebody (T1), semi-lug type body (T2), full-lug type body (T4), U-section body with flat faces (T5). Body types T2, T4 and T5 are suitable for
- Actuation: Manual / Hand, Electric, Electro-hydraulic, Pneumatic
- Connection: Threaded, Bolt Flange
- Material of Construction: Cast Iron
- Media Description: Water, Hot Water, Cold Water, Wastewater, Gas, Steam
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Supplier: XOMOX (A Crane Co. Company)
Description: XOMOX offers a broad range of high performance butterfly valves to handle virtually any process application. Available to fit ASME (ANSI) or DIN piping systems in pressure classes 150, 300 and 600 (PN 10/16, PN 25/40, and PN63/100). Standard valves are offered with soft (PTFE)
- Actuation: Manual / Hand, Electric, Electro-hydraulic, Pneumatic
- Connection: Bolt Flange
- Cryogenic Valves: Yes
- Flow (Cv): 8905
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Supplier: Clark Solutions
Description: Clark offers a complete line of Butterfly valves for both commercial and industrial applications. The valves are designed for hot and chilled water, as well as steam applications up to 10 PSI saturated steam inlet. The valves can be used for on/off or throttling control,
- Actuation: Electric
- Connection: Bolt Flange
- Material of Construction: Aluminum, Cast Iron, Ductile Iron, Steel
- Media Description: Water, Hot Water, Cold Water, Steam
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Supplier: KSB AG
Description: Design Butterfly valve for building services, with anti-condensation feature, elastomer liner (EPDM XU). With lever or manual gearbox. Semi-lug type body (type T2), suitable for downstream dismantling and dead-end service. Valve disc made of nickel-coated nodular cast iron
- Actuation: Manual / Hand, Electric, Pneumatic
- Agency / Standard: ISO
- Connection: Threaded
- Material of Construction: Cast Iron
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Supplier: KSB AG
Description: Design Butterfly valve for building services, with anti-condensation feature, elastomer liner (EPDM XU or Nitrile K). With lever, manual gearbox or pneumatic actuator. Full-lug type body (T4), suitable for downstream dismantling and dead-end service. Valve disc made of
- Actuation: Manual / Hand, Electric, Pneumatic
- Agency / Standard: ISO
- Connection: Threaded, Bolt Flange
- Material of Construction: Cast Iron
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Supplier: Radwell International
Description: BUTTERFLY VALVE, 1 INCH EPDM SEAT FOR S20, PRE-DRILLED HOLES, COLOR BLACK. FREE 2 YEAR RADWELL WARRANTY
- Valve Type: Butterfly Valves
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Supplier: Victaulic Co. of America
Description: GROOVED TYPE 6 INCH NOMINAL SIZE 6 NOMINAL SIZE - DECIMAL 6 NOMINAL SIZE - FRACTIONAL AIR WITH OIL VAPOR, MINERAL OIL, PETROLEUM PRODUCT, VEGETABLE OIL APPLICATION -20 TO 180 DEG F TEMPERATURE RATING BUBBLE TIGHT SHUT-OFF INCLUSIONS
- Actuation: Manual / Hand, Mechanical Device
- Material of Construction: Steel
- Media Description: Air, Gasoline / Diesel Fuel
- Pressure Rating: 200 psi
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Supplier: Victaulic Co. of America
Description: GROOVED TYPE 2-1/2 INCH NOMINAL SIZE 2.5 NOMINAL SIZE - DECIMAL 2-1/2 NOMINAL SIZE - FRACTIONAL AIR WITH OIL VAPOR, MINERAL OIL, PETROLEUM PRODUCT, VEGETABLE OIL APPLICATION -20 TO 180 DEG F TEMPERATURE RATING BUBBLE TIGHT SHUT
- Actuation: Manual / Hand, Mechanical Device
- Material of Construction: Steel
- Media Description: Air, Gasoline / Diesel Fuel
- Pressure Rating: 200 psi
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Supplier: Xiamen Landee Industries Co., Ltd.
Description: Lug Type Butterfly Valves with Ductile Iron Body, Available in API 609 and EN593 Standards. Model Number: LD 018-BT2 Key Specifications/Speci al Features: Body materials: cast iron, ductile iron, aluminum bronze, stainless steel and carbon steel
- Actuation: Manual / Hand
- Agency / Standard: DIN
- Connection: Bolt Flange
- Material of Construction: Aluminum, Brass / Bronze, Cast Iron, Ductile Iron, Stainless Steel, Steel, Other
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Supplier: CSA Group
Description: ISO 16136:2006 specifies requirements for the design, functional characteristics and manufacture of butterfly valves made of thermoplastics materials intended for isolating and control service, their connection to the pipe system, the body materials and their pressure/temperature
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Supplier: Victaulic Co. of America
Description: GROOVED TYPE 5 INCH NOMINAL SIZE 5 NOMINAL SIZE - DECIMAL 5 NOMINAL SIZE - FRACTIONAL AIR WITH OIL VAPOR, MINERAL OIL, PETROLEUM PRODUCT, VEGETABLE OIL APPLICATION -20 TO 180 DEG F TEMPERATURE RATING BUBBLE TIGHT SHUT-OFF INCLUSIONS
- Actuation: Manual / Hand, Mechanical Device
- Material of Construction: Steel
- Media Description: Air, Gasoline / Diesel Fuel
- Pressure Rating: 200 psi
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Supplier: Victaulic Co. of America
Description: GROOVED TYPE 1-1/2 INCH NOMINAL SIZE 1.5 NOMINAL SIZE - DECIMAL 1-1/2 NOMINAL SIZE - FRACTIONAL AIR WITH OIL VAPOR, MINERAL OIL, PETROLEUM PRODUCT, VEGETABLE OIL APPLICATION -20 TO 180 DEG F TEMPERATURE RATING BUBBLE TIGHT SHUT
- Actuation: Manual / Hand, Mechanical Device
- Material of Construction: Steel
- Media Description: Air, Gasoline / Diesel Fuel
- Pressure Rating: 200 psi
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Standards and Technical Documents - Metallic butterfly valves for general purposes -- ISO 10631:2013Supplier: CSA Group
Description: ; 16; 18; 20; (22); 24; (26); 28; 30; 32; 36; 40; 48; 56; 64; 72; 80; 88; 96. ISO 10631:2013 is applicable to butterfly valves of the following pressure designations, PN and class: PN 2,5; 6; 10; 16; 25; 40; class 125; 150; 300.
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Supplier: UL Standards & Engagement
Description: 1.1 These requirements cover butterfly valves intended for use in piping systems supplying water for fire-protection service. 1.2 The valves covered by these requirements are intended for installation and use in accordance with the Standards for: a) Low, Medium and High
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Supplier: Johnson Controls, Inc.
Description: . Our HVAC Ball Valves range from 1/2 - 20 inches and feature your choice of pneumatic, electric, spring return and non-spring return actuation. Valve Products Catalog Product Categories Threaded Ball Valves and Actuators Threaded Globe Valves and Actuators Zone
- Connection: Threaded, Bolt Flange
- Valve Size: 0.5000 to 20 inch
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Supplier: UL Standards & Engagement
Description: 1.1 These requirements cover butterfly valves intended for use in piping systems supplying water for fire-protection service. 1.2 The valves covered by these requirements are intended for installation and use in accordance with the Standards for: a) Low, Medium and High
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Supplier: Accuris
Description: VALVES, RESILIENT AND METAL SEATED, BUTTERFLY WORKING PRESSURE UP TO 200 PSI, 180 DEG. F. MAXIMUM (SHIPBOARD USE)
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Supplier: Assured Automation
Description: pressure, temperature, level, and flow of a wide variety of fluids in from -20 to 500ºF. Functions 2-way Flow Control 3-way Mixing 3-way Diverting Features & Benefits Compact rugged valve body with selection of port reductions
- Actuation: Manual / Hand, Electric, Pneumatic, Other
- Connection: Bolt Flange, Butt Weld
- Flow (Cv): 40
- Material of Construction: Brass / Bronze, Stainless Steel
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Supplier: Velan, Inc.
Description: to API 607 rev. 5 / ISO10497 (available) Emission warranty: Maximum 20 PPM Mounting pad: ISO5211 Port size: full and regular port Value added features: PEEK thrust washer increases cycle life of automated valves Locking device is included for all sizes Low emission
- Connection: Threaded, Socket Weld / Solder
- Media Description: Water, Steam
- Pressure Rating: 1500 to 2000 psi
- Valve Size: 0.5000 to 2 inch
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Description: ISO 16136:2006 specifies requirements for the design, functional characteristics and manufacture of butterfly valves made of thermoplastics materials intended for isolating and control service, their connection to the pipe system, the body materials and their pressure/temperature
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Supplier: BI-TORQ® Valve Automation
Description: shaft allow for direct mounting to a variety of valves. We can provide a complete automated assembly with our InstruPak ball valves, butterfly valves, or can be retrofit onto an existing valve with AVK Carbo-Bond customized mounting hardware.
- AC Phase: Single Phase
- AC Voltage: 115 volts
- Actuation Method: Electric
- Actuation Time: 2.5 seconds
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Supplier: BI-TORQ® Valve Automation
Description: shaft allow for direct mounting to a variety of valves. We can provide a complete automated assembly with our InstruPak ball valves, butterfly valves, or can be retrofit onto an existing valve with AVK Carbo-Bond customized mounting hardware.
- AC Phase: Single Phase
- AC Voltage: 115 volts
- Actuation Method: Electric
- Actuation Time: 5 seconds
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Supplier: BI-TORQ® Valve Automation
Description: shaft allow for direct mounting to a variety of valves. We can provide a complete automated assembly with our InstruPak ball valves, butterfly valves, or can be retrofit onto an existing valve with AVK Carbo-Bond customized mounting hardware.
- AC Phase: Single Phase
- AC Voltage: 115 volts
- Actuation Method: Electric
- Actuation Time: 12 seconds
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Supplier: Assured Automation
Description: The K4 Series is a compact industrial duty quarter turn electric actuator specifically designed for ball and butterfly valves. The K4 Series incorporates a self locking gear train, NEMA-4/4X weatherproof enclosure, visual position indicator, manual override and ISO 5211 mounting pad.
- AC Voltage: 115 volts
- Actuation Method: Electric
- Actuator Torque: 608 to 5208 In-lbs
- DC Voltage: 24 volts
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Supplier: BI-TORQ® Valve Automation
Description: shaft allow for direct mounting to a variety of valves. We can provide a complete automated assembly with our InstruPak ball valves, butterfly valves, or can be retrofit onto an existing valve with AVK Carbo-Bond customized mounting hardware.
- AC Phase: Single Phase
- AC Voltage: 115 volts
- Actuation Method: Electric
- Actuation Time: 10 seconds
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Supplier: RS Components, Ltd.
Description: ,¾ Inch (10 mm) connections,Maximum operating pressure: 20 bars Connection 1 = 3/4 in BSP Female Connection 2 = 3/4 in BSP Male Body Material = Brass Handle Type = Butterfly Handle Material = Brass For Use With = Water Distribution Operating Pressure = 20bar Connection Gender 1
- Primary Material of Construction: Brass / Bronze
- Valve Type: Shut Off Valves
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Supplier: CSA Group
Description: ISO 19240:2017 specifies requirements for design, dimensions, material, fabrication and production testing of lined metal quarter turns valves (plug valves, butterfly valves, ball valves) and check valves with flanged, wafer and wafer lug body types. It
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Supplier: UL Standards & Engagement
Description: 1.1 These requirements cover shutoff valves for trim and drain purposes for fire protection service. This standard covers valve constructions such as ball valves, butterfly valves, globe valves and plug valves. 1.2 These valves are intended for
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Supplier: CSA Group
Description: ISO 28921-1:2013 specifies requirements for design, dimensions, material, fabrication and production testing of isolation valves for low-temperature applications. It applies to gate, globe, check, butterfly and ball valves and can be used for other valve types used in
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Description: ISO 28921-1:2013 specifies requirements for design, dimensions, material, fabrication and production testing of isolation valves for low-temperature applications. It applies to gate, globe, check, butterfly and ball valves and can be used for other valve types used in
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The industry paper, provides essential guidance for specifying and installing AWWA butterfly valves in municipal water systems. It emphasizes that while butterfly valves are fundamental components, their performance is influenced by several critical (read more)
Browse Butterfly Valves Datasheets for DeZURIK, Inc. -
For the plumbing and heating sector, Bonomi North America distributes the products of the Italian company Rubinetterie Bresciane: a leading company in the production of ball, butterfly and check valves. A selection of valves to meet every need. The 250 N brass ball valve is FNPT threaded (read more)
Browse Ball Valves Datasheets for Bonomi North America, Inc. -
DFT’s Model ALC® and WLC® Wafer Style Check Valves are designed to mitigate water hammer and are the answer to unreliable double door / butterfly check valves problems. These silent check valves are (read more)
Browse Check Valves Datasheets for DFT Inc. -
media in recovery chambers. Contaminated process gas enters the RTO inlet manifold, and is directed into one of the energy recovery chambers, by the use of a system of inlet and outlet butterfly valves and manifolds. The gas passes through the first heat recovery chamber, where it absorbs heat from (read more)
Browse Thermal Oxidizers and Catalytic Oxidizers Datasheets for Branch Environmental Solutions -
that require highly accurate positioning. They are designed to automate the precise operation of valves that open and close through a rotary 90° motion (a quarter turn), such as ball valves, plug valves, choke valves, dump valves, and butterfly valves. Rotary quarter-turn actuators can also be (read more)
Browse Electric Rotary Actuators Datasheets for Indelac Controls, Inc. -
to open, close, or throttle valves that require highly accurate positioning. They are designed to automate the precise operation of valves that open and close through a rotary 90° motion (a quarter turn), such as ball valves, plug valves, choke valves, dump valves, and butterfly valves. Rotary (read more)
Browse Electric Rotary Actuators Datasheets for Indelac Controls, Inc. -
designed to automate the precise operation of valves that open and close through a rotary 90° motion (a quarter turn), such as ball valves, plug valves, choke valves, dump valves, and butterfly valves. Rotary quarter-turn actuators can also be used to automate dampers to regulate the flow of air in (read more)
Browse Electric Rotary Actuators Datasheets for Indelac Controls, Inc. -
valves, choke valves, dump valves, and butterfly valves. Rotary quarter-turn actuators can also be used to automate dampers to regulate the flow of air in chimneys and air-handling equipment for the HVAC industry. These actuators can be equipped with either an AC or DC voltage electric motor capable (read more)
Browse Valve Actuators Datasheets for Indelac Controls, Inc. -
excessive oscillation. A pressure regulator includes a restricting element, a loading element, and a measuring element: The restricting element is a valve that can provide a variable restriction to the flow, such as a globe valve, butterfly valve, poppet valve, etc. The (read more)
Browse Pressure Regulators Datasheets for Shenzhen Jewellok Technology Co., Ltd.
Conduct Research Top
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Weighing and Dispensing: Do it Right
using laminar flow booths. ? Category III: <20 mcg/m3 - >1 mcg/m3 At this point, we have reached the lower level of the capabilities of laminar flow technology and another level of control must be applied to separate the operator from the material being handled. Split butterfly valves (SBV
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Weighing and Dispensing: Do it Right
, properly designed LAF booths are sufficient for both product and operator safety. When materials with OELs of less than 20 ug/m3 are handled, we require the use of transfer bottles with split butterfly valves (SBV) and glove boxes. A separate room is normally provided for this operation. The booth
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Preliminary Dynamic Modeling of the Hanford Waste Treatment Plant Melter Offgas
20 Butterfly Valve .
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Use of chemical nickel impregnation in turbine construction for pearlitic steel parts
Typical designs for shutoff and butterfly fittings: a) spindle of DU- 20 butterfly valve ; b) spindle of DU-20 shutoff valve .
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XE-Prime EP-8A physics and startup tests. SPEAR report
Engine Five-Inch Butterfly Valves 20 .
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Revised analyses of decommissioning for the reference boiling water reactor power station. Effects of current regulatory and other considerations on the financ...
…Oemineral izers Resin Trap (with basket) Oemineral izer Hold Pump Condensate Backwash Receiving Tank S1udge Oi scharge Mixi ng Pump Condensate Decant Pump Condensate Backwash Pump Condensate Phase Separator Tank 34 Foot Loop Seal 36 Inch Flow Element 20 Inch Butterfly Valve .
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Estimating boiling water reactor decommissioning costs: A user`s manual for the BWR Cost Estimating Computer Program (CECP) software. Final report
Lg Valve Sea-Van 20 Inch Butterfly Valve .
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Revised analyses of decommissioning for the reference boiling water reactor power station. Effects of current regulatory and other considerations on the financ...
Filter Demineralizers ResinTrap (with basket) DemineralizerHold Pump CondensateBackwashReceivingTank SludgeDischargeMixing Pump CondensateDecant Pump CondensateBackwash Pump CondensatePhaseSeparatorTank 34 Foot Loop Seal 36 Inch Flow Element 20 Inch Butterfly Valve 18Inch Air OperatedButterflyValve 12Inch ButterflyValve 12Inch Air OperatedButterfly Valve 12Inch Flow Element 8 Inch Air…
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Effect of regular nozzles of plastic net on their heat and mass exchange
…pump, (11) items of the boiler installation; (12) head tank of hot water; (13) injection of additional water; (14) adjusting gate, (15) outlet duct, (16) temperature sensors, (17) the primary flow transducer, (18) diaphragm, (19) duct; ( 20 ) butterfly valve , (21) centrifugal fan.
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A Case Study of Using Very Large Skirt Can for Self-Installing Platform Foundations
…with a 0.35m/min rate) -Two pumps with hydraulic motors and remote butterfly isolation valves for each skirt can (as a contingency) -Hydraulic oil supply and return lines (1.5") via a manifold The 20 " butterfly valves were used during the…
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AWWA M49 - Butterfly Valves: Torque, Head Loss, and Cavitation Analysis
The approximate effective throttling range for a butterfly valve is 20 " to 70" open, but the range can vary based on application.
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CR4 - Thread: Butterfly Valves
Re: Operating butterfly valve below 20 % opening .