Fluid handling – Line condition change responsive valves – Bi-directional flow valves
Patent
1978-06-02
1979-12-18
Nilson, Robert G.
Fluid handling
Line condition change responsive valves
Bi-directional flow valves
1375395, 137541, F16K 1718
Patent
active
041789598
ABSTRACT:
A piston and cylinder motion dampening device having spiral groove metering, an orificed two-way pressure relief valve, a screw-on spring and an over-extension seal retainer.
REFERENCES:
patent: 824669 (1906-06-01), Moneuse
patent: 2501139 (1950-03-01), Patrick
Butler William S.
Farris Richard C.
Duzan James R.
Halliburton Company
Nilson Robert G.
Tregoning John H.
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