Pressure binding sometimes in high temperature applications the flow medium such as water or steam is trapped in the valve bonnet area when the valve is closed for system shutdown.
Split wedge type gate valve.
Ranging of the gate valves is usually made by the type of wedge used.
Split wedge or parallel disks gate valve.
Zeco wedge gate valve is one of the gate valve types.
The valve trim consists of the stem the gate the disc or wedge and the seat rings.
These are self adjusting and self aligning to both seating surfaces.
You can see the same in images.
The disk is free to adjust itself to the seating surface if one half of the disk is slightly out of alignment because of foreign matter lodged between the disk half and the seat ring.
Split wedge or flexible wedge type gate valves are expected to perform better than solid wedge gate valves when thermal binding is a concern.
The split disk can be in a wedge shape or a parallel disk type.
Split wedge gate valves have a compact design with body guided two piece gates that provide reliable operation and sealing.
The disc is free to adjust itself to the seating surface if one half of the disc is slightly out of alignment due to some foreign matter lodged between the disc and the seat ring.
Split wedge gate valves as shown in below figure are of the ball and socket design.
Nuclear conventional steam geothermal combined cycle.
Wedge gate valves are named because the two sealing surfaces resemble wedges in the body.
These are the socket and ball design valves.
Split wedge disk consists of two solid pieces and holds together with the help of a special mechanism.
The disk is free to adjust itself to the seating surface.
Split wedge gate valves are self adjusting and self aligning gate valves.
The most common were.
Split wedge gate valve.
Cast steel wedged gate valve for oil and gas industry disks of a gate valve.
Gate valves are available with different disks or wedges.