Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1984-11-06
1985-07-30
Goldberg, Howard N.
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
291495PM, 291567A, 295272, 295274, 141 1, 251315, 251359, 251368, 384297, 419 27, 419 28, 427331, 427369, 4273722, 427379, 427435, B21D 5300
Patent
active
045312737
ABSTRACT:
A valve seat for ball valves comprises a ring-shaped or annular body fabricated of sintered metal particles having interparticulate spaces which are substantially completely filled with graphite. The seat is fabricated by pumping a dispersion of colloidal graphite in a liquid carrier through the matrix of a preformed ring-shaped sintered metal body, thereafter heating the body to drive off any portion of the liquid carrier which remains in the interparticulate spaces of the body, and then coining the body to collapse any voids which remain in the body and to mechanically bind into the body the graphite which has been trapped in said interparticulate spaces during the pumping step.
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Osthues Robert H.
Smith Richard T.
Goldberg Howard N.
Wallace Ronald S.
Worcester Controls Corporation
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