What is a gate valve in piping?
A gate valve is generally used to completely shut off fluid flow or, in the fully open position, provide full flow in a pipeline. Thus it is used either in the fully closed or fully open positions. A gate valve consists of a valve body, seat and disc, a spindle, gland, and a wheel for operating the valve.
Are gate valves full bore?
When the valve is fully open, gate valves are full bore, meaning there is nothing to obstruct the flow because the gate and pipeline diameter have the same opening. This bore diameter also determines the valve size.
What is thru conduit gate valve?
Through-conduit gate valves are isolating valves designed for full closing of the working media flow. They can be used for temperatures up to 200°C. If the gate valves are used for regulating or throttling purposes, the manufacturer does not guarantee the tightness.
Why do we use gate valve?
Gate valves are used to shut off the flow of liquids rather than for flow regulation. When fully open, the typical gate valve has no obstruction in the flow path, resulting in very low flow resistance.
Can a gate valve be installed backwards?
Gate valves can be mounted in different orientations around the pipe line, but the preferred orientation is the stem placed vertical. It is not recommended to install upside down. The performance of a valve is dependent on proper mounting.
What is a slab gate valve?
Slab gate valves are comprised of a single gate unit which raises and lowers between two seat rings. Due to the fact that the gate slides between the seats, slab gate valves are suitable for the medium with suspended particles.
What are the parts of a gate valve?
Gate valves consist of three major components: body, bonnet, and trim. The body is generally connected to the piping by means of flanged, screwed, or welded connections. The bonnet, containing the moving parts, is joined to the body, generally with bolts, to permit cleaning and maintenance.
What is a knife gate valve and how does it work?
The most famous type is the knife gate valve that has a flat gate between two parallel seats (an upstream and a downstream seat) to achieve the required shut-off. The application of a parallel gate valve is limited to low pressures and low-pressure drops.
What is the open/close flow of a gate valve?
The open/close flow is achieved by moving the gate of the gate valve into or out the fluid-flow stream. The flow of the fluid through the valve can be in either direction.
What are the codes and standards for gate valves?
Applicable codes and standards for gate valve design The following codes and standards govern the design specification of gate valves: Valve Design: API 600/ API 602/ BS5352/ API 603/ API6D/ IS780 /BS 1414 / BS 14846 Valve Pressure Testing: API 598