Over sixty-five years of continuous service to the oil, gas and energy industries testifies to Greenwood Valve’s distinguished tradition of design innovation and customer satisfaction. Greenwood Valve’s engineers and skilled craftsmen turn concepts into finished products to meet the rigorous requirements of an ever- changing industry. New technologies meet new applications under the watchful supervision of professional engineers. Download Our Brochure
Self-closing Sampling Valves are designed to allow safe and quick sampling of volatile liquids under pressure on process lines, storage tanks or pressure vessels. Depressing the manual lever releases a spring-assisted plunger to draw off liquid. Releasing the lever resets the Viton or Teflon seal against the valves machined seating surface. Standard sampling valves are 316 stainless steel.
Greenwood Quick Closing Valves use a reverse check valve design to stop the flow of fluid or vapor in the event of emergency, be it fire, explosion or electrical disruption. Equipped with an external spring-assisted handle, closure is triggered by remote signal or alarm sent to electronic or pneumatic tripping devices. Fusible links which melt during a fire will allow quick closing. When resetting the valve to the normal open position, a proprietary internal relief valve breaks static pressure to help equalize pressure downstream.
Self-closing Sampling Valves are designed to allow safe and quick sampling of volatile liquids under pressure on process lines, storage tanks or pressure vessels. Depressing the manual lever releases a spring-assisted plunger to draw off liquid. Releasing the lever resets the Viton or Teflon seal against the valves machined seating surface. Standard sampling valves are 316 stainless steel.
Automatic Drain Valves prevent the accumulation of fluids, condensation, or contaminants in fire lines, standpipes, and other pipelines. When the system is unpressurized, the internal spring tension exceeds the expected static head and the valve opens. This allows fluids to escape and reduces the danger of line freezing, rupture and corrosion. When line pressure is applied, the valve automatically closes and stops flow. All components are brass except the stainless steel Viton covered stem.
Similar to standard line unions, the Greenwood Bolted Line Blind is a labor-saving positive-seal means of opening and closing process lines. Frequently found in petrochemical and cement plants, bulk loading and storage terminals, LPG and LNG gathering systems, marine facilities,steel mills, and food processing facilities, Greenwood Bolted Line Blinds are an economical solution to positive flow and positive shut-off.
Three equally-spaced spreader bolts separate the flanges to free the figure-8 spectacle plate. Reverse the self-centering spectacle to the open position for a full bore flow connection with metal-to-metal seat and secondary O-ring seal. Re-tighten the spreader bolts to restore a leak-proof connection. O-ring grooves in the spectacle enable easy replacement of the seals. Stainless helicoils insure longer thread life and greater strength. Line status is clearly visible from a distance.
Standard blinds are available in carbon steel with butt-weld end connections with Viton seals. Pressure classes include 150 or 300 in either schedule 40, 80 or 160. Special materials, end connections or seals are available on request.
Operating on the principle of a conventional threaded line union, the Greenwood Line Blind Union offers a simple and time-saving means of obtaining positive leak-proof shutoff. Common applications include compressor air and fuel lines, boiler and heater burner manifolds, storage tank foam lines and steam systems.
Greenwood Unions employ a reversible figure-B spectacle plate with O-rings to insure fully open and fully closed lines. A specially designed safety-slot is incorporated in the stationary seat to prevent spectacle blow-out. Simply loosen the nut to spread the seats, end-to-end the spectacle, and then re-tighten the nut to draw the seats together. O-ring seals on machined spectacles provide a positive seal against leakage.
Greenwood Valves is excluded from the scope of Weartech International’s AS9100 registration.