Integrated control device for a fluid circuit and applications thereof
AssigneeLes Applications Hydrauliques R. Sarrazin S.A.
InventorJacques Benilan
Life of this patent
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Abstract
The device comprises in a body a pressure limiting stage, a second stage constituting a fluid check and retarding valve and piloting means between these two stages. The second stage comprises regulating means which are easily accessible from outside the body. The device is particularly compact and is of high interest, for example when it is incorporated in a self-contained cylinder structure.
Claims18
Integrated control device for a fluid circuit, comprising a body which is provided with passage means for incorporating the device in such a circuit, and defining a cavity extending throughout the body, a first pressure limiting stage, a second stage comprising a fluid flow check and retarding valve and means disposed between said two stages for piloting the check and retarding valve by the pressure established by the limiting stage, said first stage comprising first wall means mounted in the cavity and defining a first orifice and a first valve seat surrounding the first orifice, a first closure member movably mounted relative to the body and cooperative with the valve seat, and resiliently yieldable means biasing the first closure member against the first valve seat, said second stage comprising second wall means mounted in the cavity and defining a second orifice and a second valve seat surrounding the second orifice, a second closure member disposed in a part of said cavity and movable relative to the body and cooperative with the second valve seat, and elastically yieldable means biasing the second closure member against the second valve seat, said piloting means comprising means defining a chamber in said cavity which chamber has one end defined by said first wall means, a piloting piston slidably mounted in said chamber and having an end wall which is in direct confronting relation to said first orifice, elastically yieldable means biasing the piloting piston toward said first orifice, means maintaining the piloting piston spaced away from said first wall means and thereby providing a space in said cavity between said first wall means and the piloting piston, and rigid means combined with the piloting piston for enabling the piloting piston to urge the second closure member away from the second seat as the piloting piston moves away from said first wall means, said passage means comprising a first passageway communicating with said space and for connecting to a fluid supply part of said circuit, a second passageway for connection to a fluid return part of said circuit and communicating with a part of said cavity in which said second closure member is disposed, a third passageway for connection to a reservoir of said circuit and communicating with said chamber, and a fourth passageway for connection to said reservoir of said circuit and communicating with a side of said first wall means remote from said chamber, said first closure member and said piloting piston being in coaxial relation in said cavity.
Integrated control device for a fluid circuit, comprising a body which is provided with passage means for incorporating the device in such a circuit, and defining a cavity extending throughout the body, a first pressure limiting stage, a second stage comprising a fluid flow check and retarding valve and means disposed between said two stages for piloting the check and retarding valve by the pressure established by the limiting stage, said two stages and the piloting means being disposed coaxially in the cavity, said first stage comprising a closure member mounted in a part of the cavity and a first element mounted in the cavity and defining an orifice and a seat for the closure member, said first element being hollow and receiving the closure member therein, a calibrating spring engaging the closure member and a member mounted in the first element and defining a bearing face for an end of the spring remote from the closure member, the device further comprising means defining a chamber in the body and means for connecting the chamber to a fluid reservoir, the interior of the first element communicating with the chamber by way of said orifice, and means for regulating the axial position of the member defining the bearing face for the spring relative to said orifice.
A self-contained cylinder structure comprising a motor, a case forming a reservoir for the fluid, a pump driven by the motor and associated with a control device and a base, an assembly fixed on the base and comprising a cylinder, a piston slidable in the cylinder and defining two working chambers in the cylinder and a rod connected to the piston, the cylinder structure comprising two integrated control devices incorporated in the base and suitably connected to the pump and moreover to the two working chambers in the cylinder, each of said control devices comprising a body which is provided with means for connecting the device to said pump and to said working chambers of the cylinder and defining a cavity extending throughout the body, a first pressure limiting stage, a second stage comprising a fluid flow check and retarding valve and means disposed between said two stages for piloting the check and retarding valve by the pressure established by the limiting stage, said two stages and the piloting means being disposed coaxially in the cavity.
Dependencies are inferred from the claim text.