A seal arrangement for a fluid valve has: a first sealing element configured to bear sealingly against a valve housing of the fluid valve; a second sealing element configured to bear sealingly against an adjustable, rotatable, valve body of the fluid valve; and an elastically deformable intermediate piece arranged, axially, between a first wall of the first sealing element, which faces the second sealing element, and a second wall of the second sealing element, which faces the first sealing element, so as to elastically space apart the first and second sealing elements. In at least one axial portion of the intermediate piece, an axial cross section of the intermediate piece has a first radial lateral surface and an opposite second radial lateral surface. The first radial lateral surface is convex and the second radial lateral surface is concave, planar or less convex than the first radial lateral surface.

An L-ball union drain valve member utilizes a union member with an L-ball valve that is coupled to a tee-shaped valve body with a drain port. The drain port includes an additional valve member that permits the draining/purging/filling of the drain port. The orientation of the drain port can permit the draining/purging/filling of different sections of the valve assembly, depending upon orientation of the components. The union connection permits easy disassembly and installation of the components and differing position of the handle of the valve member with respect to the tee-shaped valve body.

A dielectric union ball valve utilizes a non-conductive separation sleeve to prevent contact between the union and the nut of a dielectric valve assembly. The valve assembly can optionally include an independently operated drain valve port to permit draining of the valve assembly. The use and positioning of a non-conductive separation sleeve mitigates potential galvanic reaction between dissimilar pipes and/or fittings that are connected to the valve assembly.

A 3-way T-flow ball drain valve permits the draining/filling/purging of a hydronic or plumbing system at the end of the line. This permits the orientation of a drain port in either horizontal or vertical position while permitting end of line draining. A drain valve member is positioned to permit the opening of the drain port when the T-ball valve member in the tee-shaped valve body has been open to permit flow toward the drain port.

An embodiment integrated cooling control valve applied to a fuel cell thermal management system (TMS) includes a ball valve having at least three layers, wherein the ball valve includes a valve housing including a first port fluidly connected to a fuel cell stack, a second port coupled to a cathode oxygen depletion (COD) heater, a third port coupled to an ion filter, a fourth port coupled to a radiator, and a fifth port coupled to a coolant supply pump, and a valve plate disposed within the valve housing and including at least three layers to open and close the first port, the second port, the third port, the fourth port, and the fifth port.

A mixing valve having a first inlet port (4), a second inlet port (6) extending transverse to said first inlet port (4) and an outlet port (8). The inlet ports (4, 6) open out into a valve chamber (10) and the outlet port (8) branches off this valve chamber (10), inside which a movable valve element (12) is arranged, having an obstruction (32) inside the second inlet port (6), which protrudes from an inner circumference (36) of the second port (6) into an interior thereof. The obstruction (32) extends at least along a portion of the inner circumference (36), which portion of the circumference (36) is located on an inner side of the second inlet port (6) being distant from the first inlet port (4). A heating or cooling device includes such a mixing valve.

A tee union ball drain valve member utilizes a first valve member and a second valve member. The first valve member is positioned at the intersection of the third passageway of the valve body and the drain path. The second valve member is located in the drain path. The valve body is coupled to a tee union. The first valve member and second valve member permit draining of the valve body.

Described herein are systems and devices for controlling and monitoring liquid applications of agricultural fields. In one embodiment, a flow device for controlling flow during an agricultural operation includes an offset ball valve having multiple openings that rotate in position to control flow of a liquid through the offset ball valve to an outlet passage. The flow device also includes a first passage that provides a first flow path from an inlet to at least one opening of the offset ball valve and second passage that provides a second flow path from the inlet to at least one opening of the offset ball valve.

A seal assembly for use in a fluid valve includes: an actuatable valve body configured to open and close at least one connection of the fluid valve; at least one seal configured to sealingly abut against the valve body at one side of the valve body and to sealingly abut against a valve housing of the fluid valve at another side of the valve body; and at least one elevation from a lateral surface of the valve body integrally formed on the valve body sectionally, the at least one elevation being configured to activate the seal in a closed position of the fluid valve.

A rotational valve includes a valve closure element, a shaft, at least one detection element, at least one detection engagement means, at least one first stop and at least one second stop. The shaft is linked to the valve closure element and the shaft can rotate between a closed position and a fully open position. Each detection element comprises an aperture and an indicator element, the shaft extends through the aperture of at least one detection element, and each detection element is in sliding engagement with the shaft. The shaft can rotate relative to the detection element, each indicator element can move between a first and a second indicator position, each indicator element abuts a first stop when in the first indicator position and abuts a second stop when in the second indicator position.