A directional control valve having low or no interflow, minimal parts, and configured for easy repair, is provided. In one embodiment, a seat is slidingly sealably movable with respect to opposed plates, such that an inlet in one of the plates communicates with an internal volume of the seat, and by selectively positioning the seat with respect to one or more outlets in a second of the opposed plates, the inlet can be placed in communication with an outlet, or isolated from the one or more outlets.

Hydraulic valves for dampening pressure spikes and associated methods are disclosed herein. In one embodiment, a hydraulic valve for dampening pressure spikes includes: a spool configured to move axially inside the hydraulic valve; and a sleeve configured to at least partially house the spool. A location of the spool with respect to the sleeve may determine a flow of a working fluid through the hydraulic valve. A viscous damper is at least partially housed inside an opening in the spool, and a viscous friction between the viscous damper and the opening in the spool slows a motion of the spool.

A method for assembling a valve for a well system including disposing a longitudinal axis of a piston of the valve in a radially offset position relative a longitudinal axis of a spool of the valve, axially displacing the piston into a throughbore of the spool while the longitudinal axis of the piston is radially offset from the longitudinal axis of the spool, and radially displacing the piston relative the spool until the piston is received within the bore of a connector coupled to the spool to releasably couple the piston to the spool.

A subplate mounted (SPM) valve includes a valve body having pilot port, a piston configured to be actuated by fluid from the pilot port, a first control chamber and second control chamber each formed in the valve body and fluidicly isolated from the pilot port, a first flow restrictor fluidicly disposed between the first control chamber and the second control chamber and configured to restrict flow in at least one direction between the first control chamber and the second control chamber, a cage coupled to the valve body and having a supply port, a return port, and a work port, and a spool slidably engaged with the cage and configured to selectively restrict flow between the supply port and the return port by actuation of the piston.

The disclosure provides devices and methods for controlling the actuation rates of SPM valves by bi-directionally controlling the fluid which actuates the valve or by maintaining enclosed volumes which communicate with each other through predetermined restrictions as the valve actuates. These enclosed volumes can be completely isolated, depth compensated, share fluid with the pilot actuating fluid, or utilize the main system fluid. The restrictions can be modified to increase or decrease the actuation rates of the SPM valve. The disclosure also provides control over the main system fluid passage opening and closing positions as well as how rapidly the flow passage areas increase or decrease while opening or closing the valve.

Embodiments of a directional valve assembly that provides a single device with functionality of a two-position design for automated operation and functionality of a three-position design for manual operation. The embodiments can include a housing with a piston chamber and a spool member that transits in the housing to regulate the flow of a working fluid to a cylinder. The embodiments can also have one or more pilot operators that regulate the flow of pilot air into the piston chamber to move the spool member between two positions, i.e., two open positions. The embodiments can also have a manual operator (e.g., a lever) that can move the spool to the open positions and to a closed position. In one embodiment, the spool member is configured to remain in either a first position, a second position, or a third position in the absence of an outside stimulus on the pilot operators.

[Object] To provide a compact, rationally designed, dual 4-port electromagnetic valve that is an electromagnetic valve having functions of two 4-port valves. [Solution] A dual 4-port electromagnetic valve includes two spools (8a, 8b) slidable independently of each other in a valve hole (7); two pilot valves (4a, 4b) that drive the two spools, respectively; a main supply port (P) that communicates with the valve hole (7) at a position where the two spools face each other; first and second output ports (A1, A2) that communicate with the valve hole (7) on two respective sides of the main supply port (P), first and second discharge ports (E1, E2) that communicate with the valve hole (7) on two respective outer sides of the output ports (A1, A2), third and fourth output ports (B1, B2) that communicate with the valve hole (7) on two respective outer sides of the discharge ports (E1, E2), and first and second supply ports (P1, P2) that communicate with the valve hole (7) on two respective outer sides of the output ports (B1, B2). The main supply port (P) and each of the first and second supply ports (P1, P2) communicate with each other.

The present invention discloses a reversing value which includes a pilot valve and a main valve. The main valve includes: a valve body with a valve chamber, wherein the valve chamber is provided with a valve seat therein, and the valve seat is provided with a plurality of valve ports thereon; a plurality of flow path ports are correspondingly communicated with the plurality of valve ports; a sliding valve core matching the valve seat. When the sliding valve core (60) slides to a second preset position, the D2 port is communicated with the C port, and the S port is communicated with the E port. The present invention also discloses a cooling system with the reversing valve. The reversing valve can effectively solve the problem in the prior art that the pressure of high pressure fluid in a valve chamber of a reversing valve is unstable in the switching process.

A hydraulic valve includes a valve body having first and second ends, a bore extending therebetween, and first and second drain passages opening to the bore; a spool disposed in the bore and biased in a neutral position, the spool having first and second ends and first and second annuli axially spaced from the first and second ends respectively, whereby when the spool is in the neutral position, the first and second drain passages are connected to first and second bores respectively via the respective annulus, and wherein the spool is axially movable relative to the body by fluid acting on one of the ends to block fluid flow from the first and second bores to the first and second drain passages.

A valve, in particular a pilot-operated proportional pressure control valve, has a valve housing (5) with a pressure supply port (7), a working port (9), and a drain port (11). In the valve housing (5), a main valve piston (15) can be moved by a pilot stage (13) for control of the fluid flow between the pressure supply port (7) and the working port (9). The pilot stage (13) has a valve closing element (43) for a pilot chamber (41). The valve closing element (43) is movable from an open position (OS) into a closed position (SS) by an actuating apparatus (45). The valve closing element (43) can actuate a leakage reduction stage (53).