Provided is a flow rate regulating device including a valve body section having a flat valve body surface; a main body section including a valve chamber, an inflow channel, an outflow channel, and a communication channel; a valve seat section having a flat valve seat surface provided around an inflow opening; a regulation mechanism that moves the valve body section along an axis to regulate a distance between the valve body surface and the valve seat surface; and a control unit that controls the regulation mechanism so that the valve body section moves in a movement range in which the valve body surface and the valve seat surface maintain a non-contact state, wherein a channel cross-sectional area of the communication channel is smaller than each of a channel cross-sectional area of the inflow channel and a channel cross-sectional area of the outflow channel.

A fluid shut-off device has a valve body delimiting an inlet duct and an outlet duct and having an intermediate portion delimiting an intermediate chamber that provides fluid connection between the inlet and outlet ducts. The inlet duct has an inlet duct connection edge. The intermediate chamber has a sealing surface and accommodates a diaphragm having a diaphragm sealing portion that in a closing position of the inlet duct, cooperates, by a diaphragm support surface, with the sealing surface to occlude the inlet duct. The diaphragm has a diaphragm bending portion permanently connecting the diaphragm sealing portion to the valve body to exclusively operate under bending. The diaphragm sealing portion delimits a diaphragm seat. A control element has a control stem with predetermined transverse control stem dimension and integrally received in the diaphragm seat, which transmits movement to the diaphragm sealing portion at least between the closing position and an opening position of the inlet duct.

An animal watering valve includes a housing having an upstream end, a downstream end, a bore extending therebetween, a valve element and a valve actuator located at least in part in the bore, and a plug disposed within the bore upstream of the valve element. The plug includes a lattice structure extending along a length of the plug. The valve element may be a diaphragm disposed within the bore to separate the bore into upstream and downstream portions. The valve actuator has a stem with a stem body extending downstream from a stem head and through an outlet of the housing. The diaphragm includes a sealing surface with first and second annular ridges and a groove disposed therebetween. A stem hat having a cap and disk is coupled to a downstream end of the stem. The disk extends radially from the stem at a location upstream of the outlet.

[Object] A diaphragm can strongly be fixed to a flow path-side body by a diaphragm-holder, a thickness of the flow path-side body of an outer periphery of a diaphragm is thinned, and the flow path-side body is downsized.

[Solving Means] A diaphragm-holder abutting surface 75 is formed between a diaphragm-holder inner peripheral side ring-shaped projection 73 and a diaphragm-holder outer peripheral side ring-shaped projection 74, a diaphragm-holder inner peripheral side end surface 73s is abutted against a first fixed portion piston-side end surface 63Ap, a diaphragm-holder inner peripheral side outer peripheral surface 73o is abutted against a second fixed portion inner peripheral surface 63Bi, a diaphragm-holder outer peripheral side inner peripheral surface 74i is abutted against a body-side projection outer peripheral surface 16o, and the diaphragm-holder abutting surface 75 is abutted against the second fixed portion piston-side end surface 63Bp and a body-side projection end surface 16s.

[Object] The present invention provides a flaw rate control valve and a producing method of the flow rate control valve in which cross-linked PTFE having excellent abrasion resistance and capable of reducing a dust-generating amount is used only on a contact portion between a valve body and a valve seat.

[Solving Means] According to a flow rate control valve 1 of the invention, a flow path-side body 10 and a valve body 40 are made of fluorine-based resin composed of PFA or PTFE, and an annular or circular seal member 81 made of cross-linked PTFE is joined to a valve body-side abutting portion 40a having a valve seat 13 against which the valve body 40 abuts and to a valve seat-side abutting portion 13a of the valve seat 13 against which the valve body 40 abuts.

A bellows seal valve includes a pressurization port that can be used to apply a compensating pressure to the “atmosphere” side of the bellows, i.e. the side of the bellows that is opposite to the process fluid. The atmosphere side can be on the interior or exterior of the bellows. The compensating pressure can be greater than the process fluid pressure, to ensure that any leakage will be of pressurizing fluid into the process fluid or into the environment, and that no process fluid will escape into the environment. The pressure or flow rate of the pressurizing fluid can be monitored to detect bellows and packing leaks. A pressurizing fluid exit port can be provided, so that the pressurizing fluid can be circulated through the valve, thereby moderating the bellows temperature under conditions of extreme process fluid temperature.

A sealing diaphragm for a fluid valve is provided. The fluid valve includes a valve housing and a drive unit, the sealing diaphragm being of hat-like design and being configured for enclosing, on the free-end side, a portion of a valve-closing body which projects into the valve housing of the fluid valve. The sealing diaphragm can include a base portion which is configured to be rotationally asymmetrical on the outer circumferential side, the base portion being provided to abut in a form-fitted manner against an opening of the valve housing, and the base portion of the sealing diaphragm being configured to be received between the valve housing and the drive unit in such a way that the opening of the valve housing is sealed in a fluid-tight manner towards the drive unit.

A vacuum valve includes a valve housing (1) having a first housing part (1a) and a second housing part (1b), between which a ring-shaped housing seal (3b) is arranged, and a closure member (9) which is adjustable between an open position in which the vacuum valve is open and a closed position in which the vacuum valve is closed. The housing seal (3b) is mounted on a ring-shaped carrier (3a). Additionally on the carrier (3a) radially inside the housing seal (3b) is mounted a ring-shaped seat seal (3c) against which the closure member (9) is pressed with the closure member (9) in the closed position, wherein the seat seal (3c) abuts against a sealing face of the valve housing (1).

A high purity valve (10) includes a valve body (12) having an inlet (40) and an outlet (42) separated by a valve seat (32), and a diaphragm (22) having a central stem (23) that has a first end coupled to a piston (20) for actuating the valve, and a poppet (28) for engaging the valve seat to close the valve. The poppet forms a dual point seal (50/52, 50′/52′) with the valve seat having at least two points of contact between an annular surface (30) of the poppet and the valve seat. The annular surface of the poppet may be either a concave surface or a convex surface that provides the dual point seal. The valve has a retainer (14) adjacent the diaphragm, and the diaphragm has a flexible web (26) that extends radially outward from the central stem. The retainer has a surface (60) adjacent the web, and the surface is spaced apart from the web such that the web does not contact the surface when the valve is pressurized.

A rotary valve may be operated by automated means and permits aseptic coupling of a source fluid conduit to any of a few or many possible outlet conduits. The valve assembly may be provided with numerous connectors for output coupling but it is not necessary to connect tubing to all of them.