A valve (10) in accordance with an embodiment of the present invention includes a body (1) having a space in which a stem (3) and a ball (4) are housed, wherein an inner lid body (60) fixing the ball (4) in the space liquid-tightly partitions the space into a part in which the stem (3) is housed and a part in which the ball (4) is housed.

A housing has a housing main body and an outlet port. The housing main body includes a cylindrical housing inner wall that defines an internal space therein. The outlet port fluidly connects the internal space and an outside of the housing main body to each other. The valve has a valve body rotatable about an rotation axis along a rotation axis of the cylindrical housing inner wall. The valve is configured to selectively open and close the outlet port depending on a rotation position of the valve. The housing inner wall is formed such that a distance between the housing inner wall and the axis of the housing inner wall varies in a circumferential direction.

In a valve (10) having a pneumatic or hydraulic drive unit (20), the drive unit (20) includes a cylinder (22), a piston (24), a spindle unit (26) mounted for axial movement in the cylinder (22), and a housing cover (28), the piston (24) dividing the interior of the cylinder (22) into a cover-side space (42) and a valve seat-side space (40), and a duct (66) within the spindle unit (26) leading to the valve seat-side space (40). Formed in the housing cover (28) are a fluid intake (44) and a fluid exit (46) as well as a pressure fluid duct (48) in fluid communication with the fluid intake (44) and an outlet duct (50) in fluid communication with the fluid exit (46). The pressure fluid duct (48) branches into two partial ducts (54, 56), a first partial duct (54) extending through the spindle unit (26) into the valve seat-side space (40) and opening out there, and a second partial duct (56) opening out into the cover-side space (42), and a closure body (68) being provided which seals either the first partial duct (54) or the second partial duct (56) in a fluid-tight manner. Furthermore, a modular system (70) and a method for manufacturing valves (10) are indicated.

Staying of a drain on a cylinder attached to a lower side of a valve casing is suppressed, and occurrence of corrosion of the cylinder is suppressed. A steam valve includes a valve casing, a valve disc disposed within the valve casing, a cylinder disposed on a lower side of the valve casing and having a piston rod extending upward, a valve stem vertically penetrating a lower portion of the valve casing and having one end coupled to the piston rod via a coupling and having another end coupled to the valve disc, a cover having a larger diameter than the piston rod and the coupling and configured to separate the piston rod and the coupling from each other by being interposed between the piston rod and the coupling, and a tubular skirt hanging down from a peripheral portion of the cover and surrounding a periphery of a head portion of the piston rod.

A two-piece valve shell (body and bolted-on top bonnet) structure reduces possible leakage paths while also providing a top-side ball/stem installation/removal path (when the bonnet piece is not present) to facilitate initial valve assembly as well as subsequent inspection/removal of the ball/stem and other valve internals for conducting valve maintenance without requiring the valve body to be removed from its process connections. Internal wetted valve surfaces are coated with tantalum to provide a tantalum ball valve suitable for use as a sulfuric acid feed valve in severe high-temperature high-pressure industrial processes such as HPAL processes. Sealing cavities created by spaced-apart body-to-bonnet and/or stem-to-bonnet sealing structures can be inertly pressurized to hermetically isolate the sealing structures from ingress/leakage of corrosive process materials.

A block valve and a block valve for a raw material container having a structure in which a retaining part of a liquid material or cleaning fluid is not present inside. In a block valve (10), one side of a main flow path (18) communicating with a supply route (14) of a block body (11) and a first minimal port part (21) of a first diaphragm valve (12) disposed in a tilted state with respect to the block body are connected, another side of the main flow path and a second minimal port part (22) of a second diaphragm valve (13) are connected, a port opening (25) of the second diaphragm valve is communicated by a supply port part (15), and a joint port part (23) of the first diaphragm valve and a connection line (16) in a vertical direction are connected by a communication path (19).

An apparatus includes a valve having a hollow body and an inner sealing assembly positioned in the hollow body. The inner sealing assembly includes a piston and can be moved between an open position and a closed position to selectively control flow along a flow path through the valve. The flow path includes a bore of the piston that allows flow through the piston, and pressure within the valve from a fluid in the flow path within the valve biases the inner sealing assembly toward the closed position to stop flow through the valve. Additional systems, devices, and methods are also disclosed.

An apparatus includes a valve having a hollow body and an inner sealing assembly positioned in the hollow body. The inner sealing assembly includes a piston and can be moved between an open position and a closed position to selectively control flow along a flow path through the valve. The flow path includes a bore of the piston that allows flow through the piston, and pressure within the valve from a fluid in the flow path within the valve biases the inner sealing assembly toward the closed position to stop flow through the valve. Additional systems, devices, and methods are also disclosed.

A displacement control valve includes a valve housing, a valve element fitted in a guide passage of the valve housing, and a solenoid for driving the valve element to open and close it, a tapered portion is provided at one of an outer peripheral surface of the valve element and a guide surface of the guide passage, and a spiral groove is provided in the other, wherein the tapered portion is set such that a gap between the valve element and the guide passage is larger toward the low-pressure side than on the high-pressure side, and the tapered portion and the spiral groove are provided such that a starting point of the tapered portion is located within the region of the spiral groove in the entire range between the starting point and the ending point of the stroke of the valve element.

A valve includes a housing and a rotary body arranged notably therein with a through opening for a fluid, wherein a flow path is shut off or is at least partially opened in accordance with the rotational angle position of the rotary body about an axis of rotation, wherein the rotary body is connected to a spindle by which the rotary body is rotatable, wherein the housing is provided with a covering, and wherein the spindle reaches through the covering. The spindle is dynamically sealed by a sealing device which follows movements of the spindle relative to the housing and/or to the covering.