Greenwood Quick Closing Valve
Greenwood Quick Closing Valves consist of a WCB-grade cast carbon steel body, 316 stainless steel trim, 17-4PH shaft material, and graphite cover gasket and shaft packing. Alternative methods of construction, available upon request.
The first choice in secondary valves
These sturdy valves provide protection on pipelines and storage facilities in refineries, LPG, chemical, cement and power plants, shipyards, pumping stations, tank farms, and rail loading and unloading facilities throughout the world. As a secondary measure, Greenwood Valves provide isolation until primary emergency valves are reset and system safety is restored. Process materials include ammonia, butane propane, pentane, polypropylene, LNG, NGL, mild acids, diesel fuel and hot oil.
- 3-point contact shaft design with radial & thrust bearings to provide ease of operation
- Adjustable pull-down packing gland design to maximize packing performance
- Cast steel body and stainless steel trim to withstand corrosive internal and external atmosphere
- Internal relief valve to help equalize line pressure when resetting the valve
- Lapped seat & disc to minimize leakage under pressure
- Wound spring assembly to assure tight contact between disc and seat after valve closure
- Fusible link assembly to activate unattended valves at elevated ambient temperatures
Alternative methods to activate valve
- Remote cable control to close valve manually
- “Applied air” or “Air failure” for pneumatic operation
- “Applied power” or “Power failure” for electrical operation
- Explosion-proof limit switch for remote status indication
- Alternative body materials to suit specific applications or environments
- Injector fitting with internal lantern ring to lubricate shaft packing
Complies with clean air act
Greenwood Valves exceed specifications outlined in the 1990 Amendment to the U.S. Government Clean Air Act for ambient and elevated temperature operation. Leakage measurements were performed by an independent testing laboratory in accordance with 40 CFR Part 60, Appendix A, Method 21 regulations. Design criteria and testing was completed in conjunction with a large local refinery to satisfy local Air Quality Management District regulations.
Periodic inspection and manual activation of each valve should be performed to insure smooth valve operation. Routine maintenance should include scheduled and authorized release of pneumatic systems and electric solenoids. Valves with the optional injection fittings on shaft seals should be lubricated as needed. Recommended spare parts include fusible links, shaft packing, cover gaskets and solenoids if the valve is equipped with electrical actuators.