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Ball valves for cryogenic service

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THE cryogenic series of ball valves from Worcester Controls offer superior service life in tough and demanding applications, according to Invensys Flow Control .

The design incorporates positive ball cavity relief by use of an upstream relief hole in the ball that prevents dangerous overpressure due to thermal expansion. The stem design is blow-out proof and supported inside with thrust washers.

Belleville live loaded PTFE packing rings and stem centring followers assure zero leakage to atmosphere while the bonnet extension conforms to standard industrial practices for wall thickness and length that keeps heat transfer down, the packing frost free, operational torque low and an actuator solidly supported.

Seat and seal materials assure tight shutoff, zero body leakage and low torque at temperatures to -196°C. Material of construction include brass and 316 stainless steel and sizes range from 15mm to 150mm. The valve is available in a variety of end connections including screwed, socket and butt weld, flanged ANSI 150# and ANSI 300# available on request.

Variations to the valve configuration include a diverter valve, wafer pattern valve and a cryogenic metal seated control valve. The valves are easily automated with the addition of pneumatic or electric actuators.

Worcester Controls cryogenic valves are clean room assembled, helium leak tested and vacuum sealed and packed in a controlled environment to stringent specifications.

Worcester Controls has years of experience providing solutions for the tough applications involving cryogens. Oxygen, hydrogen, methane, ammonia, nitrogen, fluorine, LNG and deuterium can all be a potential time bomb when the wrong valve is specified.

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