A flow path switching valve includes (a) a valve body in a shape of a rectangular parallelepiped having a predetermined surface and an opposite surface, the valve body including an open flow passage having an opening on the predetermined surface, (b) a main body including a plurality of ports having a respective opening on a facing surface thereof facing the predetermined surface, and a plurality of connection flow passages each connected to respective one of the plurality of ports, (c) a pair of plate springs attached to opposite ends of the valve body to support the valve body with a predetermined gap formed between the predetermined surface and the facing surface, the plate springs applying elastic force to the valve body in accordance with an amount of movement of the valve body in a predetermined direction, and (d) an actuator for reciprocating the valve body in the predetermined direction.

A flow path switching valve includes (a) a valve body in a shape of a rectangular parallelepiped having a predetermined surface and an opposite surface, the valve body including an open flow passage having an opening on the predetermined surface, (b) a main body including a plurality of ports having a respective opening on a facing surface thereof facing the predetermined surface, and a plurality of connection flow passages each connected to respective one of the plurality of ports, (c) a pair of plate springs attached to opposite ends of the valve body to support the valve body with a predetermined gap formed between the predetermined surface and the facing surface, the plate springs applying elastic force to the valve body in accordance with an amount of movement of the valve body in a predetermined direction, and (d) an actuator for reciprocating the valve body in the predetermined direction.

Valve bodies and methods of manufacturing the same are disclosed. An example method of manufacturing a valve body includes forming a first duct extending from a first side of the valve body, forming a first wall in the valve body at least partially protruding from a surface of the first duct, the first wall defining a chamber, forming one or more openings in the first wall to fluidly couple the chamber to the first duct, and forming a second duct extending from a second side of the valve body opposite the first, the second duct fluidly coupled to the chamber.

A guide frame for a four-way reversing valve is provided. The guide frame includes a frame body. Both ends of the frame body are provided with a connecting portion, respectively. The connecting portion includes a first bending member and a second bending member, and the directions of bending of the first bending member and of the second bending member are opposite. The connecting portion is provided with a reinforcing member. The reinforcing member includes a first reinforcing plate and a second reinforcing plate. The first reinforcing plate is connected to the outer side of the first bending member by welding, and the second reinforcing plate is connected to the outer side of the second bending member by welding. Optionally, the first reinforcing plate is connected to the inner side of the first bending member by welding and the second reinforcing plate is connected to the inner side of the second bending member by welding. The connection strength of the connecting portion is increased, such that the guide frame is less likely to deform or break.

A guide frame for a four-way reversing valve is provided. The guide frame includes a frame body. Both ends of the frame body are provided with a connecting portion, respectively. The connecting portion includes a first bending member and a second bending member, and the directions of bending of the first bending member and of the second bending member are opposite. The connecting portion is provided with a reinforcing member. The reinforcing member includes a first reinforcing plate and a second reinforcing plate. The first reinforcing plate is connected to the outer side of the first bending member by welding, and the second reinforcing plate is connected to the outer side of the second bending member by welding. Optionally, the first reinforcing plate is connected to the inner side of the first bending member by welding and the second reinforcing plate is connected to the inner side of the second bending member by welding. The connection strength of the connecting portion is increased, such that the guide frame is less likely to deform or break.

An isolation knife gate valve has a valve body including pipe couplings. Removable face sealing elements are attached on either side of the valve body interior to the pipe couplings. A perimeter seal may also be mounted within the valve body. The face sealing elements may include flexible seal elements extending around the opening. The flexible seal elements may cooperate with the perimeter seal, having portions contacting side surfaces of the perimeter seal and other portions contacting faces of the valve gate.

An isolation knife gate valve has a valve body including pipe couplings. Removable face sealing elements are attached on either side of the valve body interior to the pipe couplings. A perimeter seal may also be mounted within the valve body. The face sealing elements may include flexible seal elements extending around the opening. The flexible seal elements may cooperate with the perimeter seal, having portions contacting side surfaces of the perimeter seal and other portions contacting faces of the valve gate.

A gate valve includes a valve body, a transmission base disposed in the valve body, and two gate plates disposed at two sides of the transmission base. The gate plates are connected together through an elastic member disposed in the transmission base. When the transmission base is located at a first position, the gate plates are received in a chamber and moved towards each other by the elastic member to open valve openings. When the transmission base is located at a second position, the valve openings are sealed by the gate plates, and an elastic positioning portion of the elastic member is abutted against a positioning plate of the valve body for providing a buffer positioning effect to the gate plates. Therefore, the gate valve of the present invention is opened and closed by using the elastic member, and has advantages of smooth movement, simple structure, and good adaptability.

A slide valve having a valve disc that is slidably movable between a fully-retracted fully-open position and a fully-extended fully-closed tight shutoff position by an actuating stem. The actuating stem is flexibly coupled to the valve disc. The valve disc is selectively modulated between the fully-extended fully-closed tight shutoff position and a partially-retracted non-tight shutoff position to prevent sticking of the valve disc in the fully-extended fully-closed tight shutoff position.

A slide valve having a valve disc that is slidably movable between a fully-retracted fully-open position and a fully-extended fully-closed tight shutoff position by an actuating stem. The actuating stem is flexibly coupled to the valve disc. The valve disc is selectively modulated between the fully-extended fully-closed tight shutoff position and a partially-retracted non-tight shutoff position to prevent sticking of the valve disc in the fully-extended fully-closed tight shutoff position.