A valve drive with a snap function includes a rotary drive input, a lead screw connected to or formed by the rotary drive input, a slide in threaded engagement with the lead screw to form a screw thread, the slide being mechanically connected or connectable to a valve body and being movable in the direction of a longitudinal axis. A bearing housing is provided in which the lead screw is mounted so as to be rotatable about the longitudinal axis and stationary in the direction of the longitudinal axis. The bearing housing is held against a displacement along the longitudinal axis by a releasable locking device, countering the preload force of a snap spring.

A membrane valve, with a valve housing, in which a housing interior is formed, in which housing interior a flexible control membrane is arranged. A drive plunger lies opposite a valve seat and the drive plunger has a shank body with a peripheral outer lateral surface. The outer lateral surface of the shank body of the drive plunger at least in the region of a guide section has a polygonally contoured prismatic shaping with a succession of outer side edges and outer side surfaces, wherein the edges and surfaces extend in the plunger longitudinal direction and the succession alternates in the circumferential direction of the drive plunger.

A membrane valve, with a valve housing, in which a housing interior is formed, in which housing interior a flexible control membrane is arranged. A drive plunger lies opposite a valve seat and the drive plunger has a shank body with a peripheral outer lateral surface. The outer lateral surface of the shank body of the drive plunger at least in the region of a guide section has a polygonally contoured prismatic shaping with a succession of outer side edges and outer side surfaces, wherein the edges and surfaces extend in the plunger longitudinal direction and the succession alternates in the circumferential direction of the drive plunger.

An isolation valve includes: a housing including a first passage and a second passage; a main valve assembly including a valve disposed in the housing such that a fluid flow between the first passage and the second passage is blocked; a locking assembly disposed in the housing, and including a release element configured to open the valve and a locking element configured to close the valve; and a bobbin assembly configured to be disposed in the housing and to operate the locking assembly, and including a coil; a core disposed inside the coil and including a space therein, the space including a closed end and an opened end; and a plunger configured to move in the space by an electromagnetic force generated by the coil and to contact the locking assembly on the opened end side.

An isolation valve includes: a housing including a first passage and a second passage; a main valve assembly including a valve disposed in the housing such that a fluid flow between the first passage and the second passage is blocked; a locking assembly disposed in the housing, and including a release element configured to open the valve and a locking element configured to close the valve; and a bobbin assembly configured to be disposed in the housing and to operate the locking assembly, and including a coil; a core disposed inside the coil and including a space therein, the space including a closed end and an opened end; and a plunger configured to move in the space by an electromagnetic force generated by the coil and to contact the locking assembly on the opened end side.

A valve includes a solenoid with a chamber housing a pin that actuates when the solenoid is energized. The valve also includes a spool housed within a sleeve. The sleeve includes a supply section with a supply port in communication with a supply source and a tank section with a tank port in communication with a reservoir. The spool includes a body including a first passage receiving fluid from the supply source when an opening for the first passage aligns with the supply port. When the solenoid is energized and the opening for the first passage aligns with the supply port, fluid from the supply source (i) applies a force to the spool body in a direction of actuation by the pin and (ii) flows to a second passage within the valve.

A valve includes a solenoid with a chamber housing a pin that actuates when the solenoid is energized. The valve also includes a spool housed within a sleeve. The sleeve includes a supply section with a supply port in communication with a supply source and a tank section with a tank port in communication with a reservoir. The spool includes a body including a first passage receiving fluid from the supply source when an opening for the first passage aligns with the supply port. When the solenoid is energized and the opening for the first passage aligns with the supply port, fluid from the supply source (i) applies a force to the spool body in a direction of actuation by the pin and (ii) flows to a second passage within the valve.

Systems and apparatuses include a solenoid valve including a first coil, a second coil coupled to the first coil, a banjo fitting coupled to the second coil, a spool housing coupled to the banjo fitting so that the first coil and the second coil are selectively rotatable about the spool housing, a spool received within the spool housing, and an armature received within the first coil and the second coil and including a spool actuator coupled to the spool.

An actuator is driven by a brushless motor having a rotor with axially extended magnets, permitting axial movement of the rotor while maintaining overlap between the magnets and a stator secured in a fixed position. The rotor is engaged with a fixed structure by a connection such as a ramp or thread that translates rotation into axial movement of the rotor along a rotational axis of the actuator. A valve member coupled to the rotor moves axially between a closed position and a range of positions that regulate fluid flow through a valve. A motor control circuit applies power to the stator coils to rotate the rotor and coupled valve member to a desired axial position and maintain the rotor and valve member at the selected position. The rotor and valve member may be biased toward a rotational position corresponding to a closed position of the valve member.

A solenoid valve includes: a valve housing having, at one end thereof, an inlet port through which a fluid is introduced and having, at the other end thereof, an outlet port through which the fluid is discharged; a solenoid provided in the valve housing and disposed between the inlet port and the outlet port; a first plunger provided at one end of the solenoid adjacent to the inlet port and configured to selectively open or close the inlet port by being rectilinearly moved by the solenoid; a first spring member configured to provide elastic force to allow the first plunger to move in a direction in which the first plunger closes the inlet port; a second plunger provided at the other end of the solenoid adjacent to the outlet port and configured to selectively open or close the outlet port by being rectilinearly moved by the solenoid in a direction opposite to the movement direction of the first plunger; and a second spring member configured to provide elastic force to allow the second plunger to move in a direction in which the second plunger closes the outlet port. The solenoid valve has a simplified structure while ensuring sealability.