Duo Rückschlagventil

Dual plate wafer check valve's inherent designresults in a significantly reduced weight as compared to the conventional full bodied check valve. As the valves increase in size the dual flapper check valve will be as little as one fifth the weight of the full bodied unit. This results in savings in initial cost, space, and pipe support element installation. Dual flapper check valve are installed such that the flappers are hinged at their sides like a door. Thus, the effect of gravity is eliminated. Consequently, very little energy is needed to open the valve and maintain this position, resulting in lower energy costs. Feature -RETAINERLESS BODY DESIGN The dual flapper check valves body is essentially a short, heavy wall cylinder with no holes through the body wall. There is no need for retainers and leakage to the outside is impossible. -SHOCK BUMPERS DESIGN The dual flapper check valve design utilizes heavy duty shock bumpers on the back of each disc. These bumpers meet when the valve is in the full open position thus preventing the discs from striking the stop pin. This arrangement reduces the shock force on the hinges, ensuring internal components have an extended cycle life with minimal wear under the most severe service conditions. -SUPERIOR HINGE DESIGN In order to eliminate seat wear during the opening cycle, all dual flapper check valves incorporate clearance between the hinge pin and holders, or hinge pin and disc bore. This clearance allows the disc assembly to lift off the seat prior to disc rotation preventing the heel of each disc from scraping across the body seat. Conventional designs have an oversize bore in the discs or bearings, allowing constant side to side movement of discs and increased chance of premature failure. The patented hinge pin slot allows movement in only one axis preventing premature wear. The discs, therefore, last longer and the useful life of the valve is extended. -LAPPED BODY & DISC SEATS DESIGN The heart of each valve is the seat/seal interface. This valve is manufactured using the most updated machining methods and equipment to achieve maximum flatness with a fine lapped finish. The end result is valves that easily meet and exceed test requirements of API 598 for metal-seated check valves. -UNINTERRUPTED GASKET SURFACE DESIGNThe dual flapper check valves use an internal retention method which does not encroach on the gasket sealing surface. Other retainerless designs have an internal retention method incorporating a special key and retaining screw. These components encroach on the serrated sealing face area restricting the kind of gasket that can be used. Furthermore, the screws can corrode making maintenance difficult. BENEFIT Prevents uncontrolled flow of fluids from the wellbore in case of a pipe failureAllows unobstructed flow of fluids and nitrogenInternal passage allows passage of process ballsReadily available O-ring seals for pressure integrity of CT down-hole operationsEasily converted from standard to acid service by interchanging only few partsQuickly redressed with field equipmentEasy replacement of flapper valve inserts. Standard Item Standard Design and manufacture API 594 Pressure-temperature rating ASME B16.34 Face-to-face dimension API 594 FlangeASME B16.5 Dimension *Dimensions are on request.