| 摘要 |
Valve heads for modifying a pump to handling corrosive liquids are made of the thermoplastic UHMW-PE machined into a generally rectangular block having longitudinally extending front, back, and opposite side faces and transversely extending top and bottom faces, each of the faces being smooth and flat for convenient handling and storage. Each modified valve head is provided with an elongated cylindrical valve chamber adapted to slidably receive the standard valve body and a frusto-conical manifold recess intersecting and communicating with the valve chamber and having an outer opening that opens out of its front face. Inlet and outlet ports extend from opposite side faces through the valve head and communicate respectively with the lower and upper ends of the valve chamber. In addition, bolts extend through each valve head spaced outwardly from the manifold recess and the valve chamber and inwardly from the inlet and outlet ports for releasably attaching the valve heads in fluid-tight relation to the housing in place of the standard heads, and bolts releasably hold-down the valve bodies in their valve chambers. Caustic and non-caustic liquids are delivered to, and discharged from, the pump through plastic pipes, such as PVC, connected to the inlet and outlet ports. As a result, the standard ducting through the aluminum parts is by-passed and the pump is able to handle corrosive materials without leaking and breaking down.
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