Abstract: A valve seat in a knife gate valve is positively retained between a liner and a retaining ring.

Abstract: An isolation fluid pressure detector includes a housing which bounds an internal bore and a recess situated at the axially central region of the bore and extending radially outwardly of the bore over the entire circumference of the same. A flexible sleeve-shaped element is received in the bore and includes a flexible intermediate portion which spans the recess, and two end portions which extend to a considerable distance from the flexible portion along the surface bounding the bore. The sleeve-shaped element has external arms which axially bound a confining space in the recess and are confined between end portions and an intermediate portion of the housing to seal such interfaces. A pressure gauge detects the pressure prevailing in the confining space through a measuring port of the housing.

Abstract: A tide gate check valve in which at least three converging sides are provided at a tapered region of a flexible sleeve, so that on reverse back pressure build-up of fluid, reverse fluid flow is prevented, while the valve sleeve does not invert or collapse. The present configuration features embedded reinforcing elements for resisting inversion or collapsing when the back pressure builds up. This feature is especially important for large-sized conduits of 36" or 72" diameter, or even larger, such as are common in storm sewer applications.

Abstract: A double acting pinch valve with floating pinch mechanism. Two opposed rectilinear rigid members extend transversely to a flexible deformable resilient sleeve and on opposite sides of the sleeve; the flow of fluid to be controlled is through the sleeve from one end to the other. A floating piston is provided in a container, i.e. in a cylinder, which container or cylinder also has a floating mounting and suspension. The piston rod is rigidly connected to one of the rigid members, and the floating container is rigidly connected to the other rigid member. The two rigid members and the container with integral piston all have, as a feature of the invention, a floating mounting and suspension on a frame on which the sleeve is mounted, so that these elements are freely displaceable relative to the frame and towards or away from the sleeve.

Abstract: A pinch valve for throttling or terminating the flow of a fluid through a pipe or the like. The valve features two cam bodies within an extension of the valve body. An inner cam body is cammed into non-rotational translational movement in a direction towards and away from the flexible and resilient sleeve of the pinch valve by the cam surface of an outer cam body of circular cross-section which is at least partially rotatable by displacement of a turn handle. The handle may be partially turned about the axis of the outer cam body, to partially constrict or throttle fluid flow, or further turned to completely pinch the sleeve shut and totally terminate fluid flow.

Abstract: An improved pinch valve construction which curtails and prevents end leakage where the valve is joined between two sections of duct or conduit; the valve is especially adapted for usage in large-sized piping such as ducts or conduits having diameters from 8 to 12 feet which carry bulk fluids such as drinking water, raw sewage, etc. The pinch valve configuration has end fittings which are a combination of elements including a clamping ring, which permit the easy fabrication and assembly of the valve components and eliminate the need for costly tooling and castings; standard sized components can be used. The present pinch valve construction is cheaper and better than prior art pinch valves, being less susceptible to leakage, and is readily installed and repaired. Positive control and modulation of fluid flow is attained, and the overlapping ends of the pinch valve members, which straddle the ends of the duct or conduit, assure a strong and fluid-impervious joint.

Abstract: An improved pinch valve construction comprises a pair of pinch bars spaced apart of each other, and a valve sleeve intermediate the pinch bars and having wall portions bounding a flow-through passage. A flow-control device moves the pinch bars towards and away from each other and is operative for urging the sleeve from an open configuration in which the wall portions are spaced apart at a pre-determined distance to thereby permit flow through the passage, towards a flattened configuration in which the wall portions are spaced at a distance less than the predetermined distance to thereby restrict flow through the passage. A restoring device urges the sleeve from the flattened configuration towards the open configuration, whereby any tendency of the sleeve to remain in the flattened configuration when the pinch bars are moved away from each other is counteracted.