Description

Material Name of PartMaterial Body & Disc Stainless steel Cast steel Grey cast Iron Ductile Iron Standard AISI **6, **4 ASTM A **6 Gr. WCB ASTM A **6 Class B ASTM A **6 Grade *******2 shaft Alloy Steel or Stainless steel ASTM A**2 Gr F6a ASTM A **4 , **0 or AISI **6, **4, **1 Seat NBR / EPDM/PTFE Stainless steel BS***4 or JIS K***3 AISI **6, **4 Retaining Ring Stainless steel ASTM A **6 Grade CF*8 or AISI**4 Specification Valve pressure rating: 2.5 bar~ **0 bar. Valve size: DN**0~DN***0 Valve testing: All valve testing is in accordance with AWWA C**4, latest revision which include general inspection, performance test and hydrostatic pressure test that is according to valve pressure standard. Valve coating: it is according to request for color and thickness. Control with hydraulic system The valve is hydraulically operated by an AC solenoid controlled ball valve (the solenoid is with manual operation). In case of emergency, the valve can be closed under the flow condition at maximum discharge and maximum head. The closing time is adjustable for both opening and closing. The operating mechanism consists of hydraulic cylinder and counter weight. The valve is held open by hydraulic pressure in the cylinder only, closing by loss of pressure. Manually lock is provided on disc when it is in close position by a set of control units. The cylinder is fabricated of welded steel pipe. The cylinder bore is honed to a polished finish. Flange is steel and with gaskets or seal rings to remain oil-tight at all operating pressure ranges. The rod end flanges contain a bronze bushing with sealing. The piston is made of cast steel with V type of packing and metal piston rings which is according to oil pressure rating. The rod is straight and true, made of chromium-plated forged steel. The oil pressure system is provided .Any oil leakage will be collected and returning to th