Needle Valves Hydraulic Valves
Description
Needle valves are designed to make precise adjustments in the flow of fluids. They feature a long, tapered, needle-like point that allows for fine control over the flow rate. This makes them particularly useful in applications where precise flow regulation is required.
Working Principle
Needle valves operate by using a slender, tapered point at the end of the valve stem, which is lowered through the seat to restrict or block flow. The fluid flowing through the valve turns 90 degrees and passes through an orifice that serves as the seat for a rod with a cone-shaped tip. The fine threading of the stem and the large seat area allow for precise resistance to flow, making needle valves useful for accurately regulating the flow of liquids and gases at low flow rates. This precise control is beneficial in preventing damage to delicate gauges and in applications where gradual flow adjustments are necessary.
Applications
Needle valves are commonly used in situations where precise flow control is necessary. They are employed to control flow into delicate gauges, which might be damaged by sudden surges of fluid under pressure. Additionally, they are used in applications where the flow must be gradually brought to a halt or where a small flow rate is desired. Specific examples include their use in precision dispensing systems and in hydraulic systems where fine adjustments are critical.
Advantages over other Hydraulic Valves
Needle valves offer the advantage of fine adjustment throttling, which is not as easily achievable with other types of hydraulic valves. This makes them particularly suitable for applications requiring precise flow control. Their ability to provide gradual changes in the size of the fluid flow opening sets them apart from other valves that may not offer the same level of precision.
Limitations
One limitation of needle valves is that they are generally not suitable for high flow applications due to their design, which is optimized for fine control rather than high volume throughput. Additionally, they may not be the best choice for applications involving slurries or suspended solids, as these can clog the narrow passageways of the valve.
Considerations
When considering the use of needle valves, it is important to evaluate factors such as initial costs, operating expenses, and maintenance requirements. Needle valves are typically more expensive than simpler valve types due to their precision design. However, their durability and accuracy can justify the investment in applications where precise flow control is critical. Maintenance costs may be higher if the valves are used in environments where clogging is a risk, necessitating regular cleaning or replacement.
from Rotork plc
Hydraulic Instrumentation Needle valves with dynamic sealing and non wetted threads [See More]
- Valve Type: Needle; Hydraulic
from Radwell International
HYDRAULIC NEEDLE VALVE, 2,000 PSI, 5.0 GPM, BRASS. FREE 2 YEAR RADWELL WARRANTY [See More]
- Valve Type: Needle; Hydraulic
from Radwell International
NEEDLE VALVE, 3/8 INCH NPT, BRASS, FEMALE TO FEMALE, DIRECT ACTING, HYDRAULIC ACTUATION, 13.5 GPM, N25B. FREE 2 YEAR RADWELL WARRANTY [See More]
- Valve Type: Needle; Hydraulic
from Radwell International
10008-05, HYDRAULIC VALVE, CARBON STEEL NEEDLE VALVE, 10000 PSI, HIGH PRESSURE, 90 DEGREE ANGLE, 1/4" MALE PIPE X 1/4" FEMALE PIPE. FREE 2 YEAR RADWELL WARRANTY [See More]
- Valve Type: Needle; Hydraulic
from Radwell International
NEEDLE VALVE, NV-1/4" SERIES, STAINLESS STEEL, 1/4" NPT, HYDRAULIC, 1000PSI, HARD SEAT, MALE INLET CONNECTION, FEMALE OUTLET CONNECTION. FREE 2 YEAR RADWELL WARRANTY [See More]
- Valve Type: Needle; Hydraulic
from MFP Automation Engineering
The correct valve and control components are critical to providing superior force direction and speed control for your hydraulic system. MFP will help you determine the best directional control, pressure control, and flow control valves for your specific system requirements. And of course, since MFP... [See More]
- Valve Type: Ball; Needle; Servo; Solenoid; Control Valve; Hydraulic
from Hy-Lok USA, Inc.
Union Bonnet Valves. Pressure rating up to 6000psig (410bar) at 100 ºF(38 ºC). Temperature rating form -66 ºF to 450 ºF(-54 ºC to 232 ºC) with standard PTFE pocking and up to 1200 ºF (648 ºC) with optional Grafoil packing. Body materials available in 316... [See More]
- Valve Type: Needle; Hydraulic
- Maximum Pressure: 6000.00
- Valve Size: 0.12 to 1.00
- Actuation: Manual
from co-ax valves inc.
Function: electro motorically controlled direct acting valves with integrated 3-point-regulation. Media: gaseous, liquid, highly viscous. Body Materials: aluminum, stainless steel, brass. [See More]
- Valve Type: Needle; Control Valve; Hydraulic; Underwater (optional feature); Coaxial Valve
- Maximum Pressure: 0.00 to 375.00
- Valve Size: 0.04 to 0.39
- Number of Ports: 2
from Bailey International LLC
Hydraulic valves are manufactured in a variety of styles to function in different applications. Valves are used to manipulate the flow of hydraulic fluid within a hydraulic circuit and are activated either mechanically or electronically. Directional Control Valves are the most commonly used valve in... [See More]
- Valve Type: Needle; Hydraulic
from Ideal Valve Inc.
For extremely precise control of larger flows, very precise repeatability [See More]
- Valve Type: Needle; Control Valve; Hydraulic; Metering; Mixing; Sampling; Shut Off; Anti-Siphon
- Maximum Pressure: 3000.00
- Valve Size: 0.12
- Number of Ports: 2
from HydraForce, Inc.
A screw-in, cartridge-style, variable orifi ce, hydraulic fl ow restrictor valve. [See More]
- Valve Type: Cartridge; Needle; Spool; Hydraulic
- Number of Ports: 2
- Maximum Pressure: 0.00 to 3500.00
- Positions: 2
from IBT Industrial Solutions
IBT Industrial Solutions is the expert in hydraulics products and hydraulic solutions. Our experience in fluid power and our wide array of hydraulics products will lead you to the best hydraulics solution for your business. We provide solutions to companies in various industries that rely on mobile... [See More]
- Valve Type: Check; Needle; Solenoid; Control Valve; Hydraulic; Relief
- Actuation: Manual; ElectroHydraulic
from Hy-Lok USA, Inc.
NV Series. Pressure rating up to 5,000 psi (340 bar) at 100 °F (38 °C). Temperature rating from -65 °F to 450 °F (-54 °C to 232 °C) with standard PTFE packing, and up to 600 °F (315 °C) with optional PEEK packing. Integral bonnet with one piece body is available with... [See More]
- Valve Type: Needle; Hydraulic
- Maximum Pressure: 5000.00
- Valve Size: 0.12 to 0.75
- Actuation: Manual
from HydraForce, Inc.
A screw-in, cartridge-style, variable orifice, hydraulic flow restrictor valve. It is intended for applications requiring fine adjustment over multiple turns. [See More]
- Valve Type: Cartridge; Needle; Spool; Hydraulic
- Number of Ports: 2
- Maximum Pressure: 0.00 to 3500.00
- Positions: 2
from Hy-Lok USA, Inc.
Rising Plug Valve. Pressure rating up to 6000 psig at 100 °F (38 °C). Gauge port available as option. SS316 body as standard. Sour gas service available. 100% factory tested. [See More]
- Valve Type: Needle; Plug; Hydraulic
- Actuation: Manual
- Maximum Pressure: 6000.00
from HydraForce, Inc.
Multiple function in a single cavity. Low bleed fl ow throughout the operating pressure range. High system effi ciency. Industry common cavity [See More]
- Valve Type: Cartridge; Needle; Spool; Hydraulic; Metering; Pilot
- Number of Ports: 3
- Maximum Pressure: 0.00 to 3000.00
- Positions: 2
from Hy-Lok USA, Inc.
SV Series. Pressure rating up to 6,000 psi (413 bar) at 100 °F (38 °C). Temperature rating from -65 °F to 450 °F (-54 °C to 232 °C) with standard PTFE packing, and up to 600 °F (315 °C) with optional PEEK packing. Compact and rugged body design. Body is made of... [See More]
- Valve Type: Needle; Hydraulic
- Maximum Pressure: 6000.00
- Valve Size: 0.12 to 0.50
- Actuation: Manual
from Hy-Lok USA, Inc.
SVH Series. Pressure rating up to 10,000 psi (689 bar) at 100 °F (38 °C). Temperature rating from -65 °F to 450 °F (-54 °C to 232 °C) with standard PTFE packing, and up to 600 °F (315 °C) with optional PEEK packing. Metal seal body-to-bonnet. Rugged body is machined... [See More]
- Valve Type: Needle; Hydraulic
- Maximum Pressure: 10000.00
- Valve Size: 0.25 to 0.75
- Actuation: Manual