This invention relates to a rotor gate valve 10 for use in high-pressure slurry systems. The valve 10 comprises a valve housing 12 defining a flow passage 14 therethrough for operatively receiving a fluid and an annular valve seat 16 of resilient material which is removably secured against the inner periphery of the flow passage 14.

An eclipse valve includes at least two obturator plates captured in a sealed housing that are driven to move in opposite directions relative to each other within the sealed housing. The obturator plates fill the width of a cavity within the housing and can be moved between aligned and unaligned positions. Each of the obturator plates have an opening through the plate, and when the obturator plates are aligned, the openings through the plates are aligned with each other, and with front and rear openings in the housing, allowing flow through the valve. The plates can be moved to reduce the overlap of the openings through the plates within the housing in an eclipse manner to adjust the rate or amount of flow, and to shut off flow by completely un-aligning the openings.

Disclosed is a valve mechanical linkage system. A valve comprises a main valve and a secondary valve; the system comprises a first transmission mechanism and a second transmission mechanism; the first transmission mechanism is connected with the main valve and used for converting the up-and-down reciprocating motion of the main valve into a rotational reciprocating motion; the first transmission mechanism and the second transmission mechanism are connected by means of a coupling (4), and the rotational force of the rotational reciprocating motion is transferred to the second transmission mechanism by means of the coupling (4); the second transmission mechanism is connected with the secondary valve, and achieves on-off control on the secondary valve by converting the rotational reciprocating motion into the up-and-down reciprocating motion.

An irrigation valve comprises a housing including a chamber, a fluid inlet comprising a fluid inlet passage configured to fluidly communicate with a first conduit, wherein the fluid inlet is configured to communicate fluid from the first conduit to the chamber, a fluid outlet comprising a fluid outlet passage configured to fluidly communicate with a second conduit, wherein the fluid outlet is configured to communicate fluid from the chamber to the second conduit, a rigid substrate and a stretchable, compressible and/or flexible membrane on a surface of the rigid substrate, wherein the rigid substrate is configured to be positioned so that the membrane is located between the fluid inlet and the fluid outlet when the valve is in a closed position, and wherein a fluid pressure within the chamber causes the membrane to seal a first orifice of the fluid outlet passage when the valve is in the closed position.

It is described a subsea electric actuator (100) operating a linear valve (200), the actuator (100) comprising a roller-screw (2) for translating a rotational movement of a motor (3) to a linear movement of a gate rod (4) operating the valve (200), the actuator (100) comprising: —an actuator housing (101); —an outer roller screw part (2′) rotationally connected to the motor (3) and comprising internal threads forming a first part of a first connection (10), —an inner roller screw part (2″) comprising external threads forming a second part of the first connection (10) and being arranged inside the outer roller screw part (2′), a surface of the inner roller screw part (2″) having a first interface forming a first part of a second connection (20′; 20″) connecting the inner roller screw part (2″) to a non-rotational part of the actuator (100), the second connection (20′, 20″) is configured to rotationally lock the inner roller screw part (2′) giving linear movement of the inner roller screw part (2″) when the outer roller screw (2′) is rotated, —a gate rod (4) arranged axially movable inside the inner roller screw part (2″), the external surface of the gate rod (4) comprising an interface forming a first part of a third connection (30′; 30″), —an override housing (6) arranged outside the gate rod (4) and adjacent the inner roller screw part (2″) forming an axial stop for the inner roller screw part (2″), the override housing (6) comprising an interface forming a second part of the third connection (30′; 30″), and wherein, when the third connection (30′; 30″) is connected, the inner roller screw part (2″) is locked to the gate rod (4) such that the gate rod (4) follows any axial movement of the inner roller screw part (2″), and when the third connection (30′; 30″) is disconnected, the gate rod (4) is allowed to move in the axial direction relative the inner roller screw part (2″) such that the linear valve (200) can be operated independently of the motor (3), outer roller screw part (2′) and inner roller screw part (2″). It is further described a method of performing override of a subsea electric actuator (100).

A valve member driving device capable of bidirectional movement includes: a main body with two gas chambers, a first gas-inlet opening, a first gas-inlet channel, a second gas-inlet opening, and a second gas-inlet channel; a first piston rod with a first flow passage; a second piston rod with a second flow passage; a first guide rod extending into the first flow passage at one end and having a gas socket and a gas hole in communication with the gas socket; a second guide rod extending into the second flow passage at one end and having a gas-guiding flow passage; a valve cylinder fixedly provided on the first piston rod and having a valve-cylinder gas chamber, an advance channel, a withdrawal channel, and a valve-cylinder piston rod; and a valve member fixedly provided on the valve-cylinder piston rod.

A gate valve with a locking function, includes: a housing having a first plate and a second plate, the first plate and the second plate having a valve opening penetrating therethrough respectively; a driving unit; a sliding seat having a plurality of sliding abutment members; a valve member having two cranks swingably arranged on the sliding seat; the two cranks configured to form a parallel equal crank mechanism jointly with the sliding seat and the valve member; and an elastic element; wherein when the sliding seat is at the highest position, the two cranks are of a slanted shape; when the sliding seat is at the lowest position, the two cranks are of a horizontal shape relatively to the housing.

The present invention relates generally to a pendulum valve that is installed in a connection pipe connecting a vacuum pump between the chamber of a dry etching apparatus and the vacuum pump in the etching line of a semiconductor manufacturing process and adjusts the amount of gas, and more particularly to a pendulum valve that includes a fixed housing configured such that a shaft coupled to a valve gate for adjusting the amount of gas is closely fixed to a valve housing through an O-ring and a rotation shaft (an internal shaft) coupled to the inside of the fixed housing, so that only the rotation shaft separate from the value housing is rotated by using a lip seal as a rotation axis, thereby suppressing the discharge of unnecessary particles and hardened substances while maintaining the sealing characteristics of the pendulum valve.

Pressure-reduction devices for fluid systems are disclosed. An example device includes a housing defining an axial fluid passageway between an inlet and an outlet. A first plate is fixed to the housing and positioned in the axial fluid passageway. A second plate is positioned adjacent the first plate in the axial fluid passageway. The second plate is moveable relative to the first plate between a first position to move the pressure-reducing device to a closed position to restrict or prevent fluid flow through the axial fluid passageway and a second position to move the pressure-reducing device to an open position to allow fluid flow through the axial fluid passageway.

A valve (1) having at least one closure member (2) for closing a valve opening (3) and at least one valve rod (4), at least one first connecting section (5) being provided in or on the valve rod (4), at least one second connecting section (6) being provided in or on the closure member (2), and the closure member being fastenable or fastened to the valve rod by the connection of the first connecting section to the second connecting section. The first connecting section (5) and/or the second connecting section (6) has/have at least one pressure chamber (8) for a fluid, this chamber being delimited by at least one elastically deformable boundary wall (7) and the boundary wall can be elastically deformed by the fluid provided in the pressure chamber (8) in order to form a clamped connection of the first connecting section (5) to the second connecting section (6).