Automatic reset pneumatic timer

Details Automatic reset pneumatic timer Automatic reset pneumatic timer

E - Fixed Constructions

21

B

166/41

E21B 43/12 (2006.01) F15B 21/02 (2006.01)

Patent

CA 1168575

Abstract of the Disclosure An automatic reset pneumatic timer for control of a motor valve on a lift gas injection system of an oil and gas well or a plunger-pump well installation in an oil ox gas well. The pneumatic timer includes means for connecting the timer with a source of air or gas pressure, means for connec- ting the timer with the operator of a motor valve, a cycle timer including a pneumatic valve, an on timer including a pneumatic valve, a pneumatic relay valve connected between the on timer and the motor valve for directing a pressure sig- nal to the motor valve when the on timer is operating, and a pneumatic automatic reset valve connected with the source and the cycle timer and on timer for resetting both timers to initiate a new sequence of operation when the prior sequence is completed. One form of the pneumatic timer operates solely in response to the cycle timer and on timer of the system. Another form of the pneumatic timer includes a trip valve and a shut-off-on-arrival valve for operating the pneumatic timer in response to movement of a plunger in a tubing string of a well. Both forms of the timer pneumatically control the length of time a motor valve is held open and the time period between each operation of the motor valve.

382696

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