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| Binary switch lock |
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| Rotary lock swtich for switching and resetting a computer |
| OF THE PREFERRED EMBODIMENT Referring to FIG. 1, the computer lock switch is operated by a key ... |
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| Console switch |
| We claim: 1. An apparatus for activating and deactivating an electrically powered machine, ... |
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| Lock mechanism for multi-component data processing equipment |
| The present invention relates to a lock mechanism for data processing equipment. The lock mechanism ... |
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| Rocker actuated switch assembly |
| The present invention provides a relatively low cost and simple technique for providing self ... |
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| Burner control with interrupted ignition |
| OF THE INVENTION The preferred embodiment of the invention is illustrated in FIG. 1 and is ... |
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| Plug in regulating power supply |
| What we claim is: 1. A plug in voltage regulating power supply comprising, a transformer having an ... |
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| Power controlled computer security system and method |
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Pressure balanced gate valve having selective actuator systems
| Details |
Inventors: Pierce, Jr., Elwood K.;
Assignee: Petroleum Designers, Inc. (Houston, TX)
Primary Examiner: Schwadron; Martin P.
Assistant Examiner: Walton; G. L.
Attorney, Agent or Firm: Jackson; James L.
A pressure balanced gate valve mechanism wherein a closed loop fluid interchange system interconnects the valve actuator stem area of the valve mechanism with the pressure balancing stem area and functions to accomodate volumetric changes to prevent the development of a hydraulic lock that might otherwise prevent or retard opening and closing movement of the valve mechanism. Internal back-face seating arrangements with combination metal-to-metal and elastomeric sealing elements establish seals between the valve stem and bonnet at one gate position and between the pressure balancing stem and valve body structure at the opposite gate position. An externally threaded portion of the valve bonnet is receivable within internally threaded receiver openings of a plurality of different actuator systems, including manual, mechanical, hydraulic and pneumatic actuator systems. The actuator systems are field interchangeable with the valve in service and under pressure. The valve mechanism is capable of being hydraulically energized by portable hydraulic equipment for moving the valve mechanism to a predetermined position in the event the primary drive system should become inoperative for any reason. |
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DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS Referring now to the drawings and first to FIG.
1, there is shown a gate valve mechanism generally at 10 comprising a valve body 12 that is formed to define a valve chamber 14 and inlet and outlet flow passages 16 and 18 that intersect the valve chamber.
The valve body structure also defines connection flanges 20 and 22 having a plurality of apertures 24 formed therein through which bolts or studs extend for bolted connection of the valve into a flanged flow line, wellhead or other flanged structure through which pressurized fluid is to flow.
Obviously, the valve body structure may be provided with threaded connection means, a clamping system, welded connection means or any other suitable form of connection within the spirit and scope of the present invention.
The valve chamber 14 is defined in part by a generally cylindrical wall 26 thereby causing the valve chamber 14 to be of generally cylindrical configuration.
Seat recesses 28 and 30 are formed internally of the valve body and are adapted to receive valve seat elements 32 and 34, respectively.
Seat elements 32 and 34 are floating type seats and are formed to define annular grooves at one extremity thereof for receiving annular face seal rings 36 while the opposite extremity of each sealing element receives rear sealing elements 38 in appropriately formed annular grooves.
The sealing elements 36 and 38 may be formed of any one of a number of suitable sealing materials, such as viton, polytetrafluoroethylene, etc.
, depending upon the type and characteristics of the fluid to be controlled.
It is desirable to provide means for positively supporting the seat elements 32 and 34 within the valve chamber 14 and, according to the present invention, such means of support may be provided by a pair of seat carrier elements 40 and 42.
The seat carrier elements are formed to define partially cylindrical outer surfaces 44 and 46, respectively, that have mating relation within the cylindrical wall 26 of the valve chamber
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***WITHDRAWN PATENT AS PER THE LATEST USPTO WITHDRAWN LIST*** *** NO IMAGES AVAILABLE***
Description:...
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Metal Working 
