High performance needle valves, from needle valve manufacturers like Parker, are used to control flow in delicate gauges, which might be damaged by sudden surges of fluid under pressure. They are also used in situations where the flow must be gradually halted, and where precise adjustments of flow are necessary or where a small flow rate is desired.
A typical high pressure needle valve design features a tapered pin to gradually open a space for fine control of flow, which can be controlled and regulated with a spindle. These needle valves have a relatively small orifice with a long, tapered seat, and a needle-shaped plunger on the end of a screw, which fits the seat exactly. As the screw is turned, and the plunger retracted, flow between the seat and the plunger is possible.
Parker Needle Valves
High pressure needle valves from Parker are designed for positive leak tight shut-off and regulation of fluids in process, power and instrumentation applications, and are available in a variety of styles, port sizes, temperature capabilities and pressures. Parker valves provide the user with maximum flexibility when designing tubing or piping systems.
Parker HV Series Needle Valves
The HV Series is a rotary disc valve with a robust knob manual operator. The valve is surface mounted with side ports, and three position, all ports blocked, spring return, versions are available. Pressure: 0 to 150 PSIG. Port sizes: 1/4 to 1/2.
Parker PV Series Needle Valves
Parker’s PV Series of Rising Plug and Gauge/Root Valves are available with a variety of seat and seal materials. They are screwed bonnet designs featuring bonnet lock plates. These needle valves provide a straight through flow path in two orifice sizes, utilising a non-wetted upper stem and a non-rotating lower stem in conjunction with a tapered seat for positive shut-off and long seat life, even in particulated media.
Parker U Series Needle Valves
Parker U Series Union Bonnet Valves have been engineered for use at pressures up to 6,000 psig (414 bar) and temperatures as high as 1,200 °F (649 °C). A non-rotating lower stem helps to extend packing life by removing rotation from the packing area. Stem packing below the threads isolates the thread lubricant from the flow, ensuring adequate lubrication regardless of the media.
Parker VQ Series Needle Valves
Parker VQ Series Needle Valves are the right combination of performance and value for manual or pneumatic on-off control in moderate pressure and temperature applications. The manual version employs a toggle handle for quick action at pressures up to 300 psig (21 bar). Compact double acting, normally closed, and normally open pneumatically actuated versions of this valve are ideal for automatic control at pressures up to 600 psig (41 bar).
Parker NP6 Series Needle Valves
Parker NP6 Needle Valves are designed with packing below the stem threads and a two-piece stem. The packing below the threads protects the flow stream from thread lubricant contamination or washout and also protects the stem threads from potential damaging effects of the media. The two-piece stem produces a non-rotating lower stem for superior, repeatable sealing and reduced packing wear.
Parker SN6 Series Needle Valves
Parker compact SN6 Needle Valves provide shut-off and coarse regulation of liquids and gases utilised in process and instrumentation applications. These rugged valves are manufactured from stainless steel barstock and feature integral bonnet designs with packing above the stem threads.
Parker V Series Needle Valves
Parker V Series Needle Valves are designed for positive leak tight shut-off and regulation of fluids in process, power, and instrumentation applications. With a wide variety of port sizes and styles, temperature capabilities ranging from -65 °F to 450 °F (-54 °C to 232 °C) and pressures to 5000 psig (345 bar), V Series Needle Valves provide the utmost in flexibility when designing miniaturised tubing or piping systems.