| 摘要 |
<p>1535966 Valves GEWERKSCHAFT EISENHUTTE WESTFALIA 16 Feb 1976 [19 Feb 1975] 05978/76 Heading F2V A pressure relief valve device comprises a housing 10 and a relief valve 15, 22; the housing having an inlet 12, outlets 13 and pressure relief outlet 40; the valve comprises a hollow movable seat member 15 and a closure member 22 housing a complementary sealing surface to seat 16, a stem portion 21 guided for movement within the seat 15 and head portion biased by springs 27, a piston-like support member 28 and thrust piece 29, to the closed position. The thrust piece 29 is in face to face contact with the closure to ensure even seating and minimize wear. Point contact between thrust piece 29 and piston 28, through convex end 32, produces no deformation since both parts are guided by a bore 30 of a stop member 25 for seat 15. The device is used with hydraulic pit props, a supply being connected to inlet 12 and the outlet 13 to the pressure chamber of the prop. Excess pressure first moves closure and seat upwards until stop 25 is encountered whereafter closure 22 moves away from the seat allowing fluid to pass via axial 23 and radial 24 grooves in the stem 21 to housing outlets 40.</p> |
