Cast steel O S & Y type. The one-piece design aligns stem accurately, eliminating excessive weight and unnecessary working parts. The bonnet is equipped with stainless bushing which serves as a guide for the stem and provides back seating when the valve is wide open under pressure. All the components are precision machined.
SOLID WEDGE/SPLIT WEDGE
The low center stem to wedge contact in the gate valve reduces the torque considerably. Operation is easy and the wedge does not stick when the valve is closed hot and allowed to cool. The split-wedge design compensates for minor misalignments of seals due to pipe stresses and makes the valve tight on both seating faces over a wide range of pressures. Thus we have established long cycle life.
EFFICIENT WEDGE GUIDING
Long, smooth ribs are lined up with seat rings and wedge. Seating faces do not contact each other until the valve is virtually closed. T-head wedge-stem connection with an unusual low point contact reduces torque and prevents lateral stresses on the stem.
CA 15/STELLITE FACED LEAK PROOF SEATS FOR LONG LIFE
Hard faced with CA 15/stellite ensures long seat life. Hard seat concept is advantageous since seat faces are exposed to live fluid in open condition. This results in on-line impingement on seat faces. Stellite facing reduces on-line seat wear. Seating faces are ground and lapped to mirror finish.
Heat-treated 13% Cr. Stainless steel with precision square thread. A heavy, T-head holds the wedge at full contact for uniform pull of the wedge in operation. Self-adjusting radial back seating shoulder engages with the back seat in the bonnet. Ground mirror like finish assures long life of packing that drastically reduces friction and ensures no leakages.
STRONGER, LEAK PROOF, BODY-BONNET JOINT, FULLY ENCASED GASKET
For cast steel valves we use C.A.F./spiral wound/gaskets, soft iron gaskets. For stainless steel valves we use teflon/spiral wound stainless steel gaskets. We use different types of gland packing. Special gland packing has been imported from USA ensuring zero leakage from the gland through out the life of the valve. The design of the gasket joint is critical. Its compression is better controlled in a fully encased cavity. Also the possibility of unwinding of the SS spiral metal is eliminated.
In all valves the stuffing box is deep, has high quality finish and holds high pressure or temperature packing rings ensuring tightness and long packing life. Asbestos free graphoil packing is available.
Flanges of class 150 and 300 valves have 1/16” raised face and serrated finish.
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