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.

An apparatus for noise reduction in valves is disclosed. A disclosed example valve includes a valve body including a fluid passageway, and a cage located in the fluid passageway, the cage including a wall having openings, a fluid to flow from an inner surface of the wall to an outer surface of the wall through the openings, each of the openings including respective ribs, the ribs to follow a helical path along a length of each opening to cause rotation of the fluid flowing through the openings.

An apparatus for noise reduction in valves is disclosed. A disclosed example valve includes a valve body including a fluid passageway, and a cage located in the fluid passageway, the cage including a wall having openings, a fluid to flow from an inner surface of the wall to an outer surface of the wall through the openings, each of the openings including respective ribs, the ribs to follow a helical path along a length of each opening to cause rotation of the fluid flowing through the openings.

A pump device for conveying medical fluid includes an elastomeric membrane forming a pump volume. The membrane is elastically expanded in a filling state of the pump volume with medical fluid. The expanded membrane exerts a delivery pressure on the pump volume to deliver medical fluid into a fluid-line system. The pump device also has a throttle device with a channel having an inlet connected to the pump volume and an outlet connectable to the fluid-line system. Delivery of medical fluid through the outlet is finely adjustable to a defined flow rate at the time of manufacture. The throttle device has a first body and a second body. The channel is formed between oppositely arranged surfaces of the bodies. The surfaces are movable relative to each other for fine adjustment of the flow rate at the time of manufacture, so that an effective length of the channel is variable.

A method of custom manufacturing a fluid pressure reduction device for use in a process control valve. The method includes creating the fluid pressure reduction device using an additive manufacturing technique, which generally includes forming a body and forming a plurality of flow paths in the body. The body has an inner wall and an outer wall spaced radially outward of the inner wall. The flow paths are formed in the body between the inner wall and the outer wall of the body. Each of the flow paths includes an inlet section formed in one of the inner and outer walls, a curved intermediate section, and an outlet section formed in the other of the inner and outer walls.

A method of custom manufacturing a fluid pressure reduction device for use in a process control valve. The method includes creating the fluid pressure reduction device using an additive manufacturing technique, which generally includes forming a body and forming a plurality of flow paths in the body. The body has an inner wall and an outer wall spaced radially outward of the inner wall. The flow paths are formed in the body between the inner wall and the outer wall of the body. Each of the flow paths includes an inlet section formed in one of the inner and outer walls, a curved intermediate section, and an outlet section formed in the other of the inner and outer walls.

The present invention is a differential pressure loss valve comprising a valve housing that incorporates: a sleeve that incorporates a continuous cylindrical helical thread formed in the inner surface thereof; and a cylindrical channel carrier incorporating a cylindrical helical thread formed in the outer surface thereof. When the channel carrier is positioned within the sleeve a portion of the sleeve cylindrical helical thread integrates with the channel carrier cylindrical helical thread, and a composite channel is formed there-between. The geometric configuration of the composite channel is consistent throughout such composite channel, although the geometric configuration may differ in individual embodiments of the present invention. Fluid can flow within the valve between an inlet port incorporated in the sleeve and an outlet port incorporated in the valve housing and through the composite channel, or any portion thereof between the inlet port and outlet port, if any.

The present invention is a differential pressure loss valve comprising a valve housing that incorporates: a sleeve that incorporates a continuous cylindrical helical thread formed in the inner surface thereof; and a cylindrical channel carrier incorporating a cylindrical helical thread formed in the outer surface thereof. When the channel carrier is positioned within the sleeve a portion of the sleeve cylindrical helical thread integrates with the channel carrier cylindrical helical thread, and a composite channel is formed there-between. The geometric configuration of the composite channel is consistent throughout such composite channel, although the geometric configuration may differ in individual embodiments of the present invention. Fluid can flow within the valve between an inlet port incorporated in the sleeve and an outlet port incorporated in the valve housing and through the composite channel, or any portion thereof between the inlet port and outlet port, if any.

A method of custom manufacturing a fluid pressure reduction device for use in a process control valve. The method includes creating the fluid pressure reduction device using an additive manufacturing technique, which generally includes forming a body and forming a plurality of flow paths in the body. The body has an inner wall and an outer wall spaced radially outward of the inner wall. The flow paths are formed in the body between the inner wall and the outer wall of the body. Each of the flow paths includes an inlet section formed in one of the inner and outer walls, a curved intermediate section, and an outlet section formed in the other of the inner and outer walls.

A method of custom manufacturing a fluid pressure reduction device for use in a process control valve. The method includes creating the fluid pressure reduction device using an additive manufacturing technique, which generally includes forming a body and forming a plurality of flow paths in the body. The body has an inner wall and an outer wall spaced radially outward of the inner wall. The flow paths are formed in the body between the inner wall and the outer wall of the body. Each of the flow paths includes an inlet section formed in one of the inner and outer walls, a curved intermediate section, and an outlet section formed in the other of the inner and outer walls.