A gate valve includes a valve plate that opens and closes a gate opening, a valve shaft that is fixed to the valve plate, an air cylinder that includes a drive rod, and a valve moving mechanism that causes, by expanding and contracting movements of the drive rod, the valve plate to move between a hermetically closed position at which the gate opening is hermetically closed by the valve plate and a full open position at which the gate opening is fully opened. A cylinder housing of the air cylinder is provided with a locking mechanism that locks the valve plate that has moved to the hermetically closed position and a lock detection unit that detects a locked state of the valve plate. The locking mechanism includes a lock piston that is capable of advancing and retreating with respect to the cylinder housing. A cam frame that is fixed to the drive rod has an engagement hole. The lock detection unit detects whether the lock piston is in a state of being engaged in the engagement hole.

A gate valve having a seat plate with a recessed face smaller in width than a bore of the valve. The recessed face includes an opening, which can be generally rectangular for use of the valve as a substantially linear control valve. The valve closes by movement of the gate along the recessed face to obstruct the opening, and opens by the reverse movement.

A gate valve for use in controlling the level of a dam has a first plate with an aperture on an upstream face of the dam and a movable plate on the upstream side of the fixed plate, with apertures sixed and dimensioned to operate as a scissors when the movable plate is urged in a linear motion parallel to fixed plate. One or more edges of the apertures in the plates are provided with a sharp edge or a serrate edge oriented to sever obstructing object present in the apertures when the valve is transitioning from an open position to a closed position.

An alfalfa valve telemetry system for regulating irrigation fluid to an irrigation-dependent field provides an alfalfa valve that operates over an opening to a fluid supply pipe in a field, so as to selectively discharge fluid to the field. The alfalfa valve telemetry system provides a telemetry-controlled valve actuation assembly that axially or pivotally displaces the alfalfa valve between an open position and a closed position over the opening in the pipe. A valve actuation assembly displaces the lid, axially, or pivotally, over the opening of the pipe. A mounting portion anchors the valve actuation assembly to the pipe. Environmental sensors and fluid sensors in the field communicate data signals with a primary controller that controls the valve actuation assembly. The position of the alfalfa valve is based upon the data signals received from the sensors, indicating fluid levels, fluid flow rate, and environmental conditions on and near the field.

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.

A dustproof gate valve includes a housing having a first panel, a second panel, and a valve port on each of the first and second panels, a slide including a body and a valve member and drivable to move between a first position and a second position, the slide closing the valve port of the first panel when at the first position, a driver mounted in the housing, a swing arm having one end thereof connected to the driver for moving the slide, and a dust pipe mounted in said body. When the slide is at the second position, the dust pipe is disposed between the valve port of the first panel and the valve port of the second panel, and the pipe wall of the dust pipe separates the valve ports of the first and second panels from the accommodation space.

The invention relates to a valve apparatus for a gaseous medium, having a valve body with an opening which can be flowed through in the flow direction by the medium and is delimited by way of a circumferential face in the valve body. An orifice is arranged in a gap within the valve body such that it can be displaced perpendicularly with respect to the flow direction, in order to influence the flow through the opening. The gap divides the circumferential face into an inlet-side and an outlet-side part circumferential face. The outlet-side part circumferential face has a first edge which faces the orifice and a second edge which faces away from the orifice. The first edge is assigned at least one geometrical feature which is configured to make the first edge non-uniform.

A gate valve 1 includes: a plate 2 having an opening portion 9; a plate 3 located opposite to the plate 2; a guide space 5 formed between the plates 2, 3; and a plate 6 provided in the space 5. The plate 6 is slidable along a direction in which an opening portion 11 is offset from the opening portion 9 in the space 5 in a state in which the plate 6 is pressed by the pressing portion 13 and separated from the plate 2, and a position of the plate 6 is fixed with respect to the plate 2 in the space 5 in a state in which the plate 6 is pressed by the pressing portion 16 and is in contact with the plate 2. The pressing portions 13, 16 each have a bellows structure formed by diffusion-bonding metal plates 18 and 19 to each other.

Closure element for a vacuum valve having a valve disk realized for the gas-tight closure of a process volume by means of interaction with a vacuum valve opening of the vacuum valve provided for the process volume, wherein the valve disk comprises a closure side and an oppositely situated rear side which is substantially parallel thereto and a first sealing face which is assigned to the closure side and corresponds to a second sealing face of the vacuum valve opening, in particular with regard to form and size, with cured-on sealing material, wherein the second sealing face runs around the vacuum valve opening, and a cross carrier with a receiving means for a drive component transversely with respect to an extension direction of the cross carrier, wherein the cross carrier is connected to the valve disk on the rear side of the valve disk at at least one connection point. The connection of the cross carrier to the valve disk comprises a friction stir welding connection at the at least one connection point.

A spacer having a wedge-shaped flat plate portion and an engagement protrusion is interposed between a hole end surface of mounting hole of a valve plate and a rod end surface of mounting portion of a valve rod, which thereby forms a wedge-shaped gap between the spacer and the hole end surface so as to open frontward. A fastening force of a valve-plate fixation screw generates a moment M that deforms the valve plate in a direction of narrowing the gap. At the same time, the engagement protrusion of the spacer is pressed into a wedge-shaped space between the inclined surface portion of the rod end surface and the rear hole-wall surface of the mounting hole, which causes the front hole-wall surface of mounting hole of the valve plate to press the rod front surface of mounting portion of the valve rod.