Embodiments of the invention provide a piston assembly for a control valve in a water softener system. The control valve includes a drive mechanism, one or more fluid passageways, and a seal assembly. The piston assembly includes a main piston moveably received within the seal assembly and including a first end and a second end opposite to the first end, and a shuttle piston moveably received within the seal assembly. The shuttle piston includes a first end and a second end opposite to the first end, and is configured to selectively engage the second end of the main piston to form a seal therebetween and to selectively move relative to the second end of the main piston to form an opening between the second end of the main piston and the first end of the shuttle piston, in response to movement of the main piston.

A valve (10) comprising a bore (14) extending about an actuation axis (A), wherein a spool (34) inside the bore (14) is actuated between a first working position and a second working position, and a first circumferential seal wing (56A) and a second circumferential seal wing (56B) being arranged on the spool (34). In the first working position, the first seal wing (56A) abuts to an outer first recess wall (24a) and the second seal wing (56B) abuts to an inner second recess wall (24c), so as to open some flow paths and close other flow paths. In the second working position, the first seal wing (56A) abuts to an inner first recess wall (24b) and the second seal wing (56B) abuts to an outer second recess wall (24d), so as to close some flow paths and open other flow paths.

A main flow path that introduces high-pressure air to an air cylinder, or discharges exhaust air therefrom, includes a sub flow path provided alongside the main flow path; an exhaust flow rate adjustment unit that suppresses the operation speed of the air cylinder by adjusting the flow rate of the exhaust air flowing through the sub flow path; and a switching valve that is connected between the air cylinder, the main flow path and the sub flow path, and that connects the main flow path and the sub flow path to the air cylinder in a switching manner. The switching valve is constituted by a spool valve.

A valve, includes a valve body comprising a bore having a first seal plate and a second, opposed seal plate, therein, the first seal plate including a first seal plate opening therethrough, a first port in fluid communication with the bore through the first seal plate opening, a second port in fluid communication with the bore, a third port in fluid communication with the bore, the second port disposed intermediate of the first and third ports, a bilateral sealing assembly comprising a tubular body having a first outer surface adjacent a first end face thereof, and a second outer surface adjacent a second end thereof opposite of the first end face. The bore includes a first inner cylindrical surface extending inwardly thereof from a first end thereof and a first tapered surface angled away from the first inner cylindrical surface, and a first inner cylindrical surface extending inwardly thereof from a first end thereof and a first tapered surface angled away from the first inner cylindrical surface, and with the first surface of the bilateral sealing sleeve in contact with the first seal plate, a first annular gap between the first outer surface of the bilateral sealing assembly and the first inner cylindrical surface.

A control valve (10) includes a valve body with a plurality of ports (A, B, C, D, E, F) and a plurality of annular flow passages (53, 55,57). A piston (34) which includes a plurality of annular flow passages and a longitudinal flow passage is selectively movable within a bore (32) within the valve body through operation of a valve controller (70). The valve controller is selectively operative to control the position of the piston so as to enable liquid flow through a plurality of flow paths. A pump controller is operative to selectively control operation of a water well pump that supplies water to the control valve.

A servo valve assembly includes a housing defining a cylindrical cavity having a central axis, and a spool disposed in the cavity and co-axially aligned with the central axis. A pair of transition portions define opposing conical cavity surfaces each connect a respective one of first and second cylindrical cavity portions with a third cylindrical cavity portion. The spool comprises a pair of blocking members projecting radially, and each of the blocking members defines a conical blocking surface opposing a respective one of the conical cavity surfaces to define a fluid flow passage therebetween. A cone angle of each conical blocking surface relative to the central is equal to a cone angle of the opposing conical cavity surface relative to the central axis. The spool is moveable along the central axis to vary a flow area of the flow passages between the conical blocking surfaces and the conical cavity surfaces.

A non-curable injectable ester containing packing material for use in the repair of leaking valves contains a calcium sulfonate grease containing at least one polyalphaolefin, an ester, an anti-wear/anti-galling agent, a binding/thickening agent and a plasticizing agent.

A diverter valve for fluid circulation circuits comprising a valve body provided with ports for the passage of the fluid, a pin slidingly mounted inside said body and at least one shutter combined with said pin so that to be able to slide and comprising a deformable element. A first and a second end portion of the valve body are combined with a first and a second fixed element arranged so that the first fixed element causes the compression of the deformable element following the sliding of the pin in a first direction, making it expand radially to define a fluid seal with the valve body in a first position, and the second fixed element causes the compression of the deformable element following the sliding of the pin in a second direction, making it expand radially to define a fluid seal with the valve body in a second position.

A proportional spool valve (1) for adjusting a displaced volume of a displacement pump, in particular of an oil pump in a motor vehicle, the proportional spool valve (1) includes a valve housing (2) and a valve spool (3) which is mounted in the valve housing (2) and displaceable along a displacement axis (V) and which can be displaced against the spring force of a valve spring (6) axially supported on a spring holder (7) which is fixed relative to the valve housing (2) by energizing an electrical coil assembly (10), characterized in that wherein both the preferably single-piece spring holder (7) and the valve housing (2) are made of plastic and that the spring holder (7) is welded to the valve housing (2), an integral welded connection (9) being formed.

An endoscope valve switches connection states of a plurality of conduits formed in an endoscope to supply air or water, and includes: a cap; a rod-shaped shaft; and an attachment member into which the shaft is inserted. The shaft includes a main body portion including a hole portion having a hollow space extending along the longitudinal direction from another end which is a side opposite to a side of the one end, and a check valve configured to control a flow of a fluid in a space extending along the longitudinal direction from between the shaft and the attachment member. The check valve surrounds an outer surface of the main body portion, is exposed to an outside of the main body portion via the hole portion, has a diameter forming an outer periphery which increases toward a side of the other end, and is elastically deformable.