VOLFRAM make Cast Steel Flex Gate Valves are tight sealing, easy operation, isolation valves for liquid and gaseous fluids over a wide range of line pressures and temperatures.
- Self-adjusting flexible wedge assures tight sealing and minimizes stress concentration under varied service conditions.
- Stem-wedge thrust closer to wedge centre for accurate wedge movement.
- Long guide ribs in the body to minimize seat wear.
Gate valves are of rising stem, outside, screw and yoke (OS & Y) and with Bolted Bonnet construction. The rising stem indicates open or close position of the valve. The outside screw ensures easy lubrication and prevents corrosion and erosion by line fluids. On request, valves can be supplied with special features like NACE Requirement, Radiography, Magnetic Particle Test, LGC Test and for Oxygen Service etc.
Features of Gate Valve:
Body & Bonnet:
The body is designed for strength to meet the operating conditions and contoured to minimize erosion and resistance to flow. The bonnet is provided with renewable seat arrangement.
The one piece, case flexible wedge minimizes stress concentration and assures tight sealing over a wide range of different operating temperature and pressure conditions.
Body Seat Ring:
The seat ring is welded to provide a bubble tight joint.
Back Seat Arrangement:
The back seat is designed to relieve back pressure on the stem packing when fully seated.
Gate valves can be offered with stellite seat, if specified. Stellated seat ring provides increased resistance to ware, abrasion and erosion of the sealing surface.
The stuffing box holds an adequate packing rings to enhance gland tightness and increases the life of packing rings.
ASME B 16.5 Raised Face
ASME B 16.5 to suit the corresponding pipe schedule.
Design : API 600
Face to Face / dimensions : ASME B 16.10
Testing : API 598
Valves can also be offered with IBR certification.
Valves can be supplied with accessories like extended Stem Arrangement, Gear Operation, Pneumatic and Electric Actuators, Chain Wheel Arrangement, Drain Plug and By-pass Arrangement.