Fluid flow control valves

摘要

984,776. Valves. H. TEVES, E. A. TEVES, and M. TAUSEND, [trading as ALFRED TEVES MASCHINEN-UND ARMATURENFABRIK KOMM. GES.]. July 20, 1962 [Aug. 2, 19611, No. 28010/62. Heading F2V. A valve for unloading a pump when the pressure of an accumulator loaded thereby attains a given value, has a body 5 with ports 6, 7, 8 leading from the pump, reservoir and accumulator, respectively, to a through-bore in which is a rod 21 having a piston 20 acted upon by the pressure in accumulator port 8. The rod 21, which is of slightly reduced diameter forming an annulus 9, extends through a bore groove 26 open to the pump port 6, a chamber 32 in an annular slat 13, the bore 31 of an axially-movable annular closure-member 10, and another bore groove 30; the left-hand end of the rod 21 is adjustably loaded by a pair of springs 11, 111. Adjacent the ends of the member 10 the rod is provided with flanges 22, 29; the seating face of the member 10 has its effective radius reduced by an amount X1 compared to the opposite end thereof. In the position shown grooves 26, 30, chamber 32 and bore 31 are open to pump pressure which acts on the annulus 9 and the effectively larger area to the left of the member 10 to keep the latter seated. When the accumulator pressure reaches a certain level it moves the rod 21 leftwardly relative to the member 10 and against the springs 11, 111, flange 29 being thereby out of contact with member 10 whilst flange 22 abuts the latter, further translation of the rod then unseats the member 10 and connects the pump port 6 to the reservoir port 7 via a chamber 27, the closure member 10 is brought to rest when it abuts the rod flange 29.