Parker's new half-inch (12.7mm) bore instrumentation 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. The new valve also offers a metal-to-metal seal. This provides a bubble-tight shut-off mechanism and operation over a very wide temperature range of -55 to +538C in its standard stainless steel form.

The H-series valve has 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 6000PSIG. The metal to metal sealing of the new valve also meets the firesafe requirements of ISO 10497 (the international equivalent to the API 607 and BS6755 Part 2 standards).