摘要:
A hydraulic valve assembly includes a valve body having a spool bore, a valve inlet, and a plurality of cavities opening into the spool bore; and a spool disposed in the spool bore. A first cavity fluidly connected to a tank passage; a second cavity adjacent the first cavity and fluidly connected to a first work port; a third cavity adjacent the second cavity and fluidly connected to an inlet of a another valve; a fourth cavity adjacent the third cavity and fluidly connected to a second work port; a fifth cavity adjacent the fourth cavity and fluidly connected to the valve inlet; a sixth cavity adjacent the fifth cavity and fluidly connected to the first work port; a seventh cavity adjacent the sixth cavity; an eighth cavity adjacent the seventh cavity and fluidly connected to the valve inlet; a ninth cavity adjacent the eighth cavity and fluidly connected to the inlet of the other valve; and a tenth cavity adjacent the ninth cavity and fluidly connected to the valve inlet.
摘要:
In a fluid control device, a check valve includes a first valve housing and a first diaphragm. The first diaphragm defines a first valve chamber and a second valve chamber. An exhaust valve includes a second valve housing and a second diaphragm. The second diaphragm defines a third valve chamber and a fourth valve chamber. The check valve is opened and closed by a difference in pressure between the first valve chamber and the second valve chamber. The exhaust valve is opened and closed by a difference in pressure between the third valve chamber and the fourth valve chamber.
摘要:
An oil control valve includes: a housing that is connected to an oil passage via which an oil is fed to and drained from a hydraulic device; an elongated spool that changes a state of oil feeding-drainage for the hydraulic device by moving in the housing; and a drain passage which is formed in the spool such that the drain passage extends in an axial direction of the spool and an outlet of the drain passage is provided at a radial side face of an axial end portion of the spool, and via which the oil that has entered the housing from the hydraulic device is drained, wherein the spool includes an elongated spool body, and an attachment that is separate from the spool body and is fixed at an axial end portion of the spool body.
摘要:
A valve arrangement has an adjustable control valve (10) including a control slide (12) for actuating at least one consumer connection (A, B) and an LS control line. The differential pressure of two actuating pressures (xa, xb) serves for the actuation of the control slide (12). Since the actuating pressures (xa, xb) also actuate a logic valve, which in turn influences an additional valve, and/or actuates a pressure compensator connected upstream to the control valve (10), the difference of the two actuating pressures (xa, xb) initially displaces the control slide of the control valve. The higher or the lower of the two actuating pressures (xa, xb) either actuate the further valve in the form of the additional valve, and/or influences the pressure compensator.
摘要:
Embodiments of the present invention are directed toward pressure controllers and calibrators for setting or measuring pressures in test devices. In one embodiment, the pressure controller contains a dual reference pressure controller. The dual reference pressure controller is operable to maintain two different pressures relative to a reference pressure. The first pressure being a relatively fixed amount greater than the reference pressure and the second pressure being a relatively fixed amount less than the reference pressure.
摘要:
A load sense valve assembly includes a first valve in flow communication with a pump discharge line, a second valve in flow communication with the first valve, and a third valve in flow communication with the first valve. The first valve can be a solenoid actuated directional control valve. The second and third valves can be hydraulic pilot actuated directional control valves.
摘要:
[PROBLEM] To provide a directional control valve assembly, in which a check valve for controlling a flow rate of pressure oil to be guided to a directional control valve as a main valve and a control means for limiting an opening degree of the check valve by a pressure are integrated with the directional control valve and therefore, a flow hardly occurs in the pressure oil that produces the pressure.[SOLUTION] A control means has a pressure chamber 24 for causing a pressure to act on a valve element 21 of a check valve 20, an oil chamber 39 around the valve element 21, a slot 40 formed in the valve element 21 and interconnecting the oil chamber 39 and the pressure chamber 24 with each other and, a control valve 25 connected directly to a divergence portion 17, which is interconnected with a slide hole in a directional control valve, and the oil chamber 39 and capable of permitting or cutting off communication between the divergence portion 17 and the oil chamber 39 and changing an opening degree of the communication, an intra-valve-element passage 42, a control slot 41 formed in an outer peripheral wall of the valve element 21 and communicating the intra-valve-element passage 42 and the oil chamber 39 with each other, and a spring-return auxiliary check valve 43 for allowing pressure oil to flow from a supply passage 15 into the intra-valve-element passage 42.
摘要:
An assembly of a plurality of hydraulic control valves is housed in a single-piece body. For each control valve, a spool bore and an aperture for a pressure compensation valve are provided in the monolithic body. Each spool bore is connected to several return passages and a supply passage that extend through the monolithic body. A pair of workports also is connected to each spool bore. A relief valve return passage also extends through the monolithic body and where needed, apertures for pressure relief valves extend from a surface of the monolithic body intersecting the relief valve return passage and a given workport. A load sense passage and a second supply passage also are formed in the monolithic body.
摘要:
A hydraulic directional-control valve comprises a first inlet part, a second inlet part, a tank port, a work part and a valve member which is movable from a neutral position to a operating position. In the neutral position, the valve member connects the first inlet port with the tank port and blocks the second inlet port. In the operating position, it blocks the first inlet port and connects the second inlet port with the work port. A third inlet port is provided and the valve member in the neutral position blocks the third inlet port and in the operating position connects it with the work port. The third inlet port may be supplied with hydraulic fluid in parallel with the second inlet port when an additional fluid flow is required.
摘要:
A directional control valve assembly having a pressure compensation valve in which there are provided a directional control valve in which a main spool is slidably inserted in a spool bore that is formed with a pump port, a first and a second load pressure detecting port, a first and a second actuator port, and a first and a second tank port; The pressure compensation valve that is connected with the pump port, includes: a pressure releasing zone which is adapted to the first and second load pressure detecting ports with the first and second tank ports when the spool lies its neutral position, and to block the first or second load pressure detecting port from the first or second tank port when the main spool lies at an intermediate site between the neutral position and a pressurized fluid supply position, and a passage having a counter flow preventing function for communicating the first or second actuator port and first and second load pressure detecting port with each other when the spool lies at an intermediate site between the neutral position and the pressurized fluid supply position.