Needle & Plug Valves

Needle and plug valves for throttling and straight shut-off of liquid, gas and vapour service, in ten products covering screwed bonnet, integral bonnet and colour-flow designs.

The screwed bonnet valves are the core of the range and are supplied with female, male-by-female and double-ferrule tube ends. Angle-pattern versions are available for the same duty where the line has to turn. Testing is hydrostatic at 620 kg/cm² on the body and 413 kg/cm² on the seat, with a 40 kg/cm² pneumatic seat test, in sizes from 1/4 in to 1 in across NPT and BSP.

Integral bonnet needle valves are compact units for isolating lines, sampling and throttling, offered with screwed ends for pipe and tube and with double-ferrule tube ends, from 1/8 in to 1 in. They are tested at 413 kg/cm² on the body and 280 kg/cm² on the seat. Materials across both bonnet designs are A 105, A 479 SS304 and SS316, A 182 Gr F 316 stainless, Monel and Hastelloy, with PTFE gland packing as standard and Graphoil above 180 °C.

The colour-flow valves are the metering members of the range. Both the control valve and the needle valve carry a micrometer adjustment with coloured rings that indicate the number of complete turns open, so a setting can be read off and repeated; the control valve additionally gives free flow in one direction and controlled flow in the reverse. They are supplied in steel and brass to DIN 259 gas threads or ANSI B 2.1 NPT, from 1/4 in to 1-1/2 in. Steel bodies are rated to 400 kg/cm² up to 1/2 in and 300 kg/cm² from 3/4 in; brass to 150 kg/cm² up to 1 in and 50 kg/cm² above. Plug valves in screwed bonnet design complete the range with male, female and double-ferrule end options.