Solid wedges, flexible wedges, and split wedges are being used in valves having inclined seats. Parallel disks are being used in valves having parallel seats.Regardless of the form of wedge or disk used, the disk is frequently replaceable. In services where solids or high velocity might cause rapid erosion in the seat or disk view here , these factors should have a higher surface hardness and needs to have replacement seats along with disks.
If the seats will not be replaceable, seat damage requires removal on the valve on the line for refacing in the seat, or refacing from the seat available. Valves used in corrosion service should normally be specified with replaceable seats.
Disks of the Gate valve
Gate valves can be purchased with different disks or wedges. Ranging on the Gate valves is generally made by the wedge used.
Solid wedge is considered the most commonly used disk by its simplicity and strength.
A valve using this type of wedge could be installed in each position in fact it is suitable for most liquids. The solid wedge can be a single-piece solid construction, and is also practically for turbulent flow.
Flexible wedge is usually a one-piece disc having a cut across the perimeter to increase the ability to correct mistakes or modifications in the angle between seats.
The reduction will change in size, shape and depth. A shallow, narrow cut gives little flexibility but retains strength.
A deeper and wider cut, or cast-in recess, leaves little material in the center, that allows more flexibility, but compromises strength.
Split wedge is self-adjusting and selfaligning to both seats sides. This wedge type is made up of two-piece construction which seats between tapered seats from the valve body. This type of wedge is ideal for the therapy for non-condensing gases and liquids at normal temperatures, particularly corrosive liquids.
Because from the diversity of construction materials, trim offerings, and design combinations provided by gate valves, they're appropriate for numerous applications. From high-temperature coking units to food and pharmaceutical services, gate valves could be trusted to reliably perform.
The protected seat-face kind of double expanding and slab gate valves eliminates degradation in the seat face brought on by debris within the process fluid, causing them to be ideal for liquid service gate valve. When additional protection is necessary at points in pipeline applications where operational integrity is necessary and the consequences of environmental exposure are higher, like near waterways and municipalities, double expanding gate valves certainly are a particularly wise choice.
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