Process instrument isolation valve

Details Process instrument isolation valve Process instrument isolation valve

1998-10-07

2000-04-25

Chambers, A. Michael

Fluid handling

With indicator, register, recorder, alarm or inspection means

Fluid pressure responsive indicator, recorder or alarm

137872, 251269, 251368, F16K 3712

Patent

active

060532009

ABSTRACT:
A process instrument isolation valve is disclosed having a valve body, a plurality of valve seats, a stem, a plug attached to the stem, and an actuator. The valve has an inlet, a sensor port and a vent port. In use, the valve is opened allowing process material to enter the sensor port where a measurement is taken. When measurement is complete, the valve is closed. As the valve closes, process material exits the valve through the vent port while at the same closing off the valve to the process, preventing process material from flowing from the process to the vent line.

REFERENCES:
patent: 1558789 (1925-10-01), Carney
patent: 2169043 (1939-08-01), Goehring
patent: 2657005 (1953-10-01), Van Nest
patent: 3361160 (1968-01-01), Alper
patent: 4782861 (1988-11-01), Ross
High Integrity Valves Descote, Inc. flyer on Gland Packed or Bellows Sealed 3 Way Valve.

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