US 4,074,695 AGranted

Pressure-relief valve devices

AssigneeGewerkschaft Eisenhutte Westphalia

InventorsWalter Weirich, Willy Kussel

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Abstract

A pressure-relief valve device has a housing with bores for admitting and discharging pressure fluid. The fluid admitted to the housing passes via a hollow member or sleeve to a valve inlet. The sleeve has at its upper end a chamfered seating surface for engaging with a sealing surface of a valve member and these surfaces form the valve. The valve member has a head with the sealing surface at its periphery and a stem which is guided within the sleeve. The stem is axially and circumferentially grooved to allow pressure fluid to pass through the housing to flush dirt away from the valve inlet even while the valve is closed. Opposed spring forces bias the surfaces of the valve together and a stop member limits the movement of the sleeve. The spring or springs acting on the valve member engage on a support member and this support member engages via a punctiform contact with a thrust piece. The support member and thrust piece are guided within a bore in the stop member and the thrust piece protrudes from this bore to engage over the entire end face of the head of the valve member.

Claims13

Dependent claims

A pressure-relief valve device comprising:

(a) a housing provided with conduit means for admitting hydraulic pressure fluid into the housing, and conduit means for discharging hydraulic pressure fluid from the housing;
(b) a hollow member disposed in the housing and guided and sealed for displacement therein, the hollow member being provided with a valve seating surface;
(c) a valve closure member having a portion thereof guided by the hollow member for displacement therein, the valve closure member having a complementary sealing surface engageable on the seating surface of the hollow member to effect closure of the valve constituted by the two surfaces, the valve closure member having channel means communicating through the interior of the hollow member with the admitting conduit means of the housing to permit pressure fluid to reach the inlet side of the valve, and the valve having an outlet side which communicates with the discharging conduit means of the housing;
(d) stop means for limiting movement of the hollow member in one direction as the hollow member is displaced by the pressure of the fluid admitted by the admitting conduit means;
(e) plural spring means for providing a force to the valve to urge the two surfaces thereof together to thereby bias the valve into a closed condition, the plural spring means being composed of first spring means acting on the hollow member to bias the hollow member in said one direction, and second spring means acting on the valve closure member in the opposite direction;
(f) means for transmitting force from the second spring means to the valve closure member utilizing a pair of surfaces at least one of which is non-planar so that the surfaces engage one another over a zone aligned centrally of the sealing surface of the valve closure member, said transmitting means including a thrust member in face-to-face contact with one end of the valve closure member remote from the guided portion thereof, said contact being over an extended area;
and
(g) guide means for guiding said thrust member for axial movement centrally of the sealing surface of the valve closure member.

5 more elements

In a pressure relief valve device which includes a housing with conduit means for receiving pressure fluid and conduit means for discharging said fluid for relief;

a hollow plunger member guided for movement in the housing and limited by stop means when subjected to the pressure of the fluid at the receiving means, the hollow plunger member being sealed exteriorly to the housing in respect of the receiving and the discharging means;
and a valve closure member having a head and a stem, the stem of the valve closure member being received in the hollow plunger member, and the head of the valve closure member having a sealing surface which engages with a seating surface of the hollow plunger member to form therewith a valve which opens against spring restoring force to establish communication between the receiving and the discharging means through the interior of the hollow plunger member when excess pressure occurs;
the improvement therein comprising:
(a) the stem of the valve closure member being grooved to establish fluid communication between the interior of the hollow plunger member and the valve inlet;
(b) spring means biasing the hollow plunger member and the valve closure member towards the stop means in the same direction as that traveled by the valve closure member under pressure of the fluid received at the valve inlet;
(c) the stop means having a bore which is coaxial with and which is aligned with the direction of movement of the hollow plunger member and the valve closure member;
(d) further spring means being located on the side of the stop means remote from the hollow plunger member;
and
(e) first and second components serving to transmit thrust from said further spring means to the valve closure member, said first and second components being located by the bore in the stop means, said thrust components engaging each other by interaction of their curvilinear and planar facing surfaces which contact each other over a central zone which is coincidental with the axis of the bore, on of said thrust components engaging substantially the entire end face of the head of the valve closure member adjacent the sealing surface thereof.

6 more elements

Dependencies are inferred from the claim text.