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Leak detection arrangement for valve having sealing means

  • US 4,010,769 A
  • Filed: 11/25/1974
  • Issued: 03/08/1977
  • Est. Priority Date: 11/27/1972
  • Status: Expired due to Term
First Claim
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1. Valve construction comprising:

  • actuating means,a valve body having a fluid inlet passage and a fluid outlet passage, a valve seat between said inlet and outlet passages and a cavity above the valve seat,a valve flow control plunger operatively arranged between the actuating means and the valve seat and extending through the cavity in the valve body and responsive to the actuating means for movement relative to the valve seat for correspondingly controlling fluid flow through the valve seat from the inlet passage to the outlet passage,spaced apart first and second diaphragms correspondingly secured between the plunger and the valve body for sealing against fluid flow to the actuating means, the second diaphragm sealing against fluid flow along the plunger beyond the first diaphragm,a leak detection passage extending from the interior of the valve body outwardly to the exterior thereof and located between the first and second diaphragms for the flow of any fluid leaking past the first diaphragm to a visible location outside of the valve body, anda spacer in the cavity surrounding the plunger and located between the first and second diaphragms and having an opening therethrough defining a portion of the detection passage.

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