Paul Boughton
A novel half-inch (12.7mm) bore instrumentation needle valve from Parker gives plant engineers the means to improve reliability and save money and space in process and instrumentation applications involving viscous and contaminated media. This offers advantages over the conventional alternative of using much larger and more expensive piping valves. Believed to be the first of its type on the market, the half-inch needle valve has been developed by the instrumentation products division of Parker Hannifin.
Parker's new H-series needle valve is available in two forms: as either a discrete hand valve for controlling media flow, or integrated into a monoflange-style manifold for the safe 'double-block-and-bleed' connection of instruments to process lines.
The large flow path of the half-inch H-series needle valve makes it much less prone to blockages or related problems when dealing with viscous and contaminated media. Such problems can lead to measurement errors, necessitating costly maintenance or even process shutdowns while problems are fixed. The new valve also offers a metal-to-metal seal that provides a bubble-tight shut-off mechanism and operation over a very wide temperature range of -55 to +538 degrees C in its standard stainless steel form.
Parker's H-series valve has a bore size of 1/2 inch (12.7mm), with a Cv value of 2.6. In its standard form the valve is fabricated from 316 stainless steel and is rated for operation at pressures up to 6,000psig (414barg). The metal-to-metal sealing also meets the firesafe requirements of ISO 10497 (the international equivalent to the API 607 and BS 6755-2).
According to Parker, the valve design can help process engineers achieve new levels of compactness and performance in a wide range of process and instrumentation applications involving difficult media. These applications include level measurement in refineries, chemical injection, gas lines that are prone to hydrate formation, and process lines carrying dangerous gases. The monoflange variant, in particular, extends application potential, as these space-saving manifolds are often favoured in sensitive applications such as skids for oil and gas platforms. By extending the bore size of monoflange needle valves to half an inch, engineers can now employ monoflange form-factor manifolds on skids handling liquid or gas media that are prone to hydrate deposition - thereby saving considerable weight and size compared with conventional double-block-and-bleed manifolds.
For more information, visit www.parker.com
Parker's new H-series needle valve is available in two forms: as either a discrete hand valve for controlling media flow, or integrated into a monoflange-style manifold for the safe 'double-block-and-bleed' connection of instruments to process lines.
The large flow path of the half-inch H-series needle valve makes it much less prone to blockages or related problems when dealing with viscous and contaminated media. Such problems can lead to measurement errors, necessitating costly maintenance or even process shutdowns while problems are fixed. The new valve also offers a metal-to-metal seal that provides a bubble-tight shut-off mechanism and operation over a very wide temperature range of -55 to +538 degrees C in its standard stainless steel form.
Parker's H-series valve has a bore size of 1/2 inch (12.7mm), with a Cv value of 2.6. In its standard form the valve is fabricated from 316 stainless steel and is rated for operation at pressures up to 6,000psig (414barg). The metal-to-metal sealing also meets the firesafe requirements of ISO 10497 (the international equivalent to the API 607 and BS 6755-2).
According to Parker, the valve design can help process engineers achieve new levels of compactness and performance in a wide range of process and instrumentation applications involving difficult media. These applications include level measurement in refineries, chemical injection, gas lines that are prone to hydrate formation, and process lines carrying dangerous gases. The monoflange variant, in particular, extends application potential, as these space-saving manifolds are often favoured in sensitive applications such as skids for oil and gas platforms. By extending the bore size of monoflange needle valves to half an inch, engineers can now employ monoflange form-factor manifolds on skids handling liquid or gas media that are prone to hydrate deposition - thereby saving considerable weight and size compared with conventional double-block-and-bleed manifolds.
For more information, visit www.parker.com
