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Drain valve

  • US 5,433,410 A
  • Filed: 05/27/1994
  • Issued: 07/18/1995
  • Est. Priority Date: 05/27/1994
  • Status: Expired due to Fees
First Claim
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1. A drain valve comprising, in combination:

  • a tubular housing assembly comprising;

    a threaded section for threading said tubular housing assembly into a drain hole,a cylindrical section and a polygonal nut section located between the threaded section and the cylindrical section,a first bore of a first diameter and a second bore, axially aligned with said first bore, of a second diameter larger than said first diameter, a junction of said first bore and said second bore forming a shoulder;

    a valve stem assembly comprising;

    a valve stem having an outer diameter slidably engaging the first bore of said tubular housing assembly, said valve stem comprising;

    a closed end having a first annular groove for reception of a C-clip and second annular groove for reception of a first O-ring, said first and second annular grooves being formed in the outer circumference of the closed end of said valve stem, an open end,a drainage bore extending from said open end to said closed end, anda pair of diametrically opposed inlets adjacent said closed end for permitting fluid external to said valve stem to pass into said drainage bore;

    an actuator having a small diameter bore, said valve stem being press fit into said small diameter bore in order for the valve stem to be joined with the actuator to form the valve stem assembly, and a large diameter bore slidably engaging an outer diameter of the cylindrical section of said tubular housing assembly; and

    a compression spring slidably disposed over said valve stem and further disposed between said shoulder of said tubular housing assembly and said actuator, said compression spring providing a force for closing said drain valve by axially urging said actuator away from said cylindrical section.

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