A freeze tolerant ball valve for controlling the direction of expansion of freezing water within the ball valve is disclosed. The valve includes valve body inlet and the valve body outlet, and a spherical-shaped gate that has an axial fluid passage that extends through the spherical-shaped gate. The spherical-shaped gate can be rotated to block fluid communication between the valve body inlet and the valve body outlet. The valve body also has a first sidewall that is of a first sidewall thickness, and a sidewall having a boss that supports a concave cap that has a bottom wall that is of a bottom wall thickness, the bottom wall thickness being substantially thinner than the sidewall thickness. The cooperation of the passage through the spherical-shaped gate, the first sidewall with its first sidewall thickness positioned opposite to the bottom wall of the concave cap results in a valve that directs the effects of freezing on to the concave cap, which would fail first in the event of freezing. The cap can be easily and quickly replaced in the event of failure.

A freeze tolerant ball valve for controlling the direction of expansion of freezing water within the ball valve is disclosed. The valve includes valve body inlet and the valve body outlet, and a spherical-shaped gate that has an axial fluid passage that extends through the spherical-shaped gate. The spherical-shaped gate can be rotated to block fluid communication between the valve body inlet and the valve body outlet. The valve body also has a first sidewall that is of a first sidewall thickness, and a sidewall having a boss that supports a concave cap that has a bottom wall that is of a bottom wall thickness, the bottom wall thickness being substantially thinner than the sidewall thickness. The cooperation of the passage through the spherical-shaped gate, the first sidewall with its first sidewall thickness positioned opposite to the bottom wall of the concave cap results in a valve that directs the effects of freezing on to the concave cap, which would fail first in the event of freezing. The cap can be easily and quickly replaced in the event of failure.

The invention relates to a slide valve (20) having a slide valve plate (32) movable in a slide valve rail (29) between a locked position and an open position in a slide valve casing (26), said slide valve rail (29) being provided with a slide valve seal for attaining a gas-proof locked position, said slide valve rail (29) being connected to the slide valve casing (26) via a flange connection in such a manner that the slide valve rail (29) is removable from the slide valve casing (26) radially to a flow axis of the slide valve (20).

The invention relates to a slide valve (20) having a slide valve plate (32) movable in a slide valve rail (29) between a locked position and an open position in a slide valve casing (26), said slide valve rail (29) being provided with a slide valve seal for attaining a gas-proof locked position, said slide valve rail (29) being connected to the slide valve casing (26) via a flange connection in such a manner that the slide valve rail (29) is removable from the slide valve casing (26) radially to a flow axis of the slide valve (20).

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 actuator includes a motor, an AC power source, a DC braking system, and a control system. The control system is configured to control the AC power source to apply an AC voltage to the motor to drive a valve toward a closed position. The control system is configured to disconnect the AC voltage from the motor before the valve reaches the closed position. The control system is configured to control the DC braking system to apply a DC voltage to the motor to stop motion of the valve.

An electrically operated gas flow regulating valve in which a needle valve body (2) is moved axially through a motion conversion mechanism (4) by the rotation of an electric motor (3). The motion conversion mechanism (4) includes: a guide tube (5) in which is formed axially elongated slits (51) with which cam pins (21) fixed to the needle valve (2) are slidably engaged; and a tubular cam body (6) having a spiral cam part with which the cam pins (21) are engages through elongated slits (51). In an arrangement in which one of the guide tube (5) and the cam body (6), e.g., the guide tube (5), is rotated by the electric motor (3), hysteresis is restrained from occurring. The cam part disposed in the cam body (6) is constituted by a spirally inclined sides (61) with which the cam pins (21) are brought into contact from axial one direction. A spring member (7) is disposed so as to urge the cam pins (21) in the other of the axial directions toward the spirally inclined sides (61).

An electrically operated gas flow regulating valve in which a needle valve body (2) is moved axially through a motion conversion mechanism (4) by the rotation of an electric motor (3). The motion conversion mechanism (4) includes: a guide tube (5) in which is formed axially elongated slits (51) with which cam pins (21) fixed to the needle valve (2) are slidably engaged; and a tubular cam body (6) having a spiral cam part with which the cam pins (21) are engages through elongated slits (51). In an arrangement in which one of the guide tube (5) and the cam body (6), e.g., the guide tube (5), is rotated by the electric motor (3), hysteresis is restrained from occurring. The cam part disposed in the cam body (6) is constituted by a spirally inclined sides (61) with which the cam pins (21) are brought into contact from axial one direction. A spring member (7) is disposed so as to urge the cam pins (21) in the other of the axial directions toward the spirally inclined sides (61).

A split body, rotary C gate, removeable stem vacuum valve using an input assembly with handle extensions that allow for hand movement of the incoming pipe to access an inner aperture body with a curved sealing face that directly seals to a C shaped gasketless gate that can be rotated into and out of the inner body aperture for easy cleaning. The gasketless gate is held in position using gate axles with an outer axle stem connected to a polygon lower body that mates into a matching polygon aperture on the gasketless gate. The middle valve assembly's gasketless housing body defines upper and lower axle washer pockets for locating the axles for proper operation and simple axle pins for securing the axles in position.

A split body, rotary C gate, removeable stem vacuum valve using an input assembly with handle extensions that allow for hand movement of the incoming pipe to access an inner aperture body with a curved sealing face that directly seals to a C shaped gasketless gate that can be rotated into and out of the inner body aperture for easy cleaning. The gasketless gate is held in position using gate axles with an outer axle stem connected to a polygon lower body that mates into a matching polygon aperture on the gasketless gate. The middle valve assembly's gasketless housing body defines upper and lower axle washer pockets for locating the axles for proper operation and simple axle pins for securing the axles in position.