In a connection mechanism that connects a valve shaft to air cylinders, shake prevention mechanisms are disposed at facing portions at which outer side surfaces of side frames face inner side surfaces of housings of the air cylinders and/or facing portions at which inner side surfaces and of the side frames face left-hand and right-hand side surfaces of a center frame. The shake prevention mechanisms include a sliding member that is disposed on a sliding surface that is formed on one of two surfaces that face each other and on the other and a spring mechanism that presses the sliding member in a direction in which the sliding member comes into contact with the sliding surface.

A method of controlling chemical concentration in electrolyte includes measuring a chemical concentration in an electrolyte, wherein the electrolyte is contained in a tank; and increasing a vapor flux through an exhaust pipe connected to the tank when the measured chemical concentration is lower than a control lower limit value.

A sealing apparatus includes a moveable seal holder with a cavity and includes a seal assembly disposed at least partially in the cavity. The seal assembly includes a resilient seal member including a fluid-facing end with a fluid-facing end surface, and the seal assembly includes an actuator plate configured to reciprocate between a first and a second position relative to the protective plate. The first actuator plate includes a fluid-facing end surface and a first camming surface. The seal assembly further includes a first protective plate disposed between the seal member and the first actuator plate. The actuator plate is configured to compress the seal member and to move the fluid-facing end surface of the seal member outward from a resting position when the actuator plate is in the second position.

A valve which comprises a body (1), a closing member (2) movable in a space (11) between walls (9, 10) of the body transversely in relation to a flow passageway (3) provided through the body between at least two positions, a first position in which the flow passageway (3) is closed, and a second position in which the flow passageway is open, and an actuator (4) for moving the closing member (2) linearly between said at least two positions, which body (1) further comprises an edge part (12, 34). The valve comprises a cleaning arrangement in which an aperture (35, 36) for conducting a medium is arranged in the valve body (1), in a part of the body (1) located on the side of the closing member (2) actuator (4), and is configured to spray a cleaning medium into a part of the space located between walls (9, 10, 12, 34) of the space (11) and the closing member (2). The invention also relates to a method.

An annulus pressure release system includes a gas metering valve assembly having a fluid pathway. The gas metering valve assembly includes a pressure sensor configured to be fluidly coupled to an annulus and to output a sensor signal indicative of a fluid pressure within the annulus. The gas metering valve assembly also includes an electronically actuated adjustable control valve disposed along the fluid pathway and a electronically actuated two-position valve disposed along the fluid pathway. Furthermore, the gas metering valve assembly includes a flow controller. The flow controller, in response to determining the fluid pressure exceeds a threshold pressure, is configured to output a first control signal to the electronically actuated two-position valve indicative of instructions to open the electronically actuated two-position valve, and to output a second control signal to the electronically actuated adjustable control valve indicative of instructions to adjust a flow of fluid through the fluid pathway.

An assembly for actuating a gate valve. The assembly includes an actuator and a bonnet adapter and stem adapter. The assembly includes a bonnet adapter configured to attach to the actuator and configured to attach to a bonnet of the gate valve. An actuator stem is attached to the actuator and extends at least in part into the bonnet adapter. A stem adapter is configured to be positioned within the bonnet adapter and attach to the actuator stem and to a gate valve stem. The bonnet adapter further includes access windows for accessing the stem adapter and the bonnet adapter is configured to permit the actuator stem and stem adapter to move axially therewithin.

The gate housing has a flow passage therethrough, the flow passage having an inlet and an outlet. The gate housing also includes a gate pocket configured to receive a blast gate and to allow the blast gate to slide therein between an open position and a closed position. The magnetic brake element is on the gate housing and includes a magnet mounted to the gate housing such that a magnetic force of the magnet extends into the gate pocket.

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 check valve bleed assembly eliminates the requirement for a person to enter the red zone when bleeding the grease out of a gate or other valve. A gas or other fluid is provided to the check valve bleed assembly. The gas or other fluid acts upon the surface driving a pin into the associated check valve with sufficient force to overcome the resistance of the object sitting on a seat and moves the object off of the seat. The force is maintained as long as is necessary. Usually, the check valve is held open until the gate transitions into the gate's associated gate recess thereby displacing the grease within the gate recess through the check valve, into the check valve bleed assembly, and finally to a waste collection tube. In some embodiments a gate valve greasing access port is included in the check valve bleed assembly such that grease may be injected into the check valve bleed assembly.