A double-seat valve includes a first closing element associated with a first valve seat, a second closing element associated with a second valve seat, a hollow rod connected to the second closing element, a valve rod connected to the first closing element and extending through the hollow rod, a first diaphragm fastened to the hollow rod and to a housing of the valve, and a second diaphragm arranged to seal a channel between the valve rod and hollow rod. The second closing element includes an annular body connected to a supporting section, the annular body and the supporting section designed to clamp the second diaphragm and the connection region to a gap seal against an interior. To simplify the design and to ensure reliable functioning under hygienic conditions, the supporting section has a leakage channel that forms a section of a fluid connection between the connection region and the channel.

A double-seat valve includes a first closing element associated with a first valve seat, a second closing element associated with a second valve seat, a hollow rod connected to the second closing element, a valve rod connected to the first closing element and extending through the hollow rod, a first diaphragm fastened to the hollow rod and to a housing of the valve, and a second diaphragm arranged to seal a channel between the valve rod and hollow rod. The second closing element includes an annular body connected to a supporting section, the annular body and the supporting section designed to clamp the second diaphragm and the connection region to a gap seal against an interior. To simplify the design and to ensure reliable functioning under hygienic conditions, the supporting section has a leakage channel that forms a section of a fluid connection between the connection region and the channel.

A flow rate adjusting device of the present invention includes a flow channel member and a valve mechanism. The valve mechanism includes a rod, a knob and a lock mechanism. The lock mechanism is switched by the knob moving in the traverse direction between a prohibited state in which the engaging portion is engaged with the to-be-engaged portion so that the rotation of the rod relative to the flow channel member is prohibited via the knob and a permitted state in which the engagement between the engaging portion and the to-be-engaged portion is undone so that the rod is permitted to rotate relative to the flow channel member.

The invention discloses a valve element for an electronic expansion valve, which includes a rotor core and a hollow rotor cylinder sleeved outside the rotor core. Ribs and positioning grooves of a positioning device on the valve element are changed, so that the positioning grooves and an inner wall of a guiding section hole are stepped, an even thickness of the inner wall is maintained, and a working performance of the electronic expansion valve is improved.

A flow control valve including a valve body, stepper motor, and valve member. The valve member includes a poppet that can slide longitudinally within a bore of the valve body when the stepper motor receives electricity. A diaphragm, extending inwardly from the valve body to the valve member, deflects in response to movement of the valve member. A flow control needle, mounted to the poppet of the valve member, is at least partially received in an outlet port of the valve body. The flow control needle cooperates with an inner surface of the outlet port to define an outlet flow orifice that varies in size when the valve member moves between open and closed positions. In the closed position, a seat engagement surface of the valve member contacts a valve seat of the valve body to create a fluid-tight seal.

A flow control valve including a valve body, stepper motor, and valve member. The valve member includes a poppet that can slide longitudinally within a bore of the valve body when the stepper motor receives electricity. A diaphragm, extending inwardly from the valve body to the valve member, deflects in response to movement of the valve member. A flow control needle, mounted to the poppet of the valve member, is at least partially received in an outlet port of the valve body. The flow control needle cooperates with an inner surface of the outlet port to define an outlet flow orifice that varies in size when the valve member moves between open and closed positions. In the closed position, a seat engagement surface of the valve member contacts a valve seat of the valve body to create a fluid-tight seal.

A reciprocating body (2) has valve element (6) including deflecting surface (10a), valve shaft (7) guided by guide cylinder (4), and packing (8) having an annular shape circularly brought into close contact with valve seat (12a) in a state where the reciprocating body (2) is in a closed position. The valve element (6) includes large diameter portion (9a), and small diameter portion (9b) and deflecting portion (10). The large diameter portion (9a) has flange surface (9d) supporting the packing (8) in a state where the packing (8) is exposed to the primary flow passage side. The flange surface (9d) is formed such that the flange surface (9d) is allowed to come into contact with the valve seat (12a) via the packing (8). Recess (9c) is formed on the outer periphery of the small diameter portion (9b), and a portion of the packing (8) is fitted in the recess (9c).

A reciprocating body (2) has valve element (6) including deflecting surface (10a), valve shaft (7) guided by guide cylinder (4), and packing (8) having an annular shape circularly brought into close contact with valve seat (12a) in a state where the reciprocating body (2) is in a closed position. The valve element (6) includes large diameter portion (9a), and small diameter portion (9b) and deflecting portion (10). The large diameter portion (9a) has flange surface (9d) supporting the packing (8) in a state where the packing (8) is exposed to the primary flow passage side. The flange surface (9d) is formed such that the flange surface (9d) is allowed to come into contact with the valve seat (12a) via the packing (8). Recess (9c) is formed on the outer periphery of the small diameter portion (9b), and a portion of the packing (8) is fitted in the recess (9c).

A double-seat valve includes a first closing element associated with a first valve seat, a second closing element associated with a second valve seat, a hollow rod connected to the second closing element, a valve rod connected to the first closing element and extending through the hollow rod, a first diaphragm fastened to the hollow rod and to a housing of the valve, and a second diaphragm arranged to seal a channel between the valve rod and hollow rod. The second closing element includes an annular body connected to a supporting section, the annular body and the supporting section designed to clamp the second diaphragm and the connection region to a gap seal against an interior. To simplify the design and to ensure reliable functioning under hygienic conditions, the supporting section has a leakage channel that forms a section of a fluid connection between the connection region and the channel.

A double-seat valve includes a first closing element associated with a first valve seat, a second closing element associated with a second valve seat, a hollow rod connected to the second closing element, a valve rod connected to the first closing element and extending through the hollow rod, a first diaphragm fastened to the hollow rod and to a housing of the valve, and a second diaphragm arranged to seal a channel between the valve rod and hollow rod. The second closing element includes an annular body connected to a supporting section, the annular body and the supporting section designed to clamp the second diaphragm and the connection region to a gap seal against an interior. To simplify the design and to ensure reliable functioning under hygienic conditions, the supporting section has a leakage channel that forms a section of a fluid connection between the connection region and the channel.