Gate valves and knife valves are advantageous in applications involving slurries, for their “gates” can reduce right through the slurry. They are also found in applications which involve viscous liquids including heavy oils, light grease, varnish, molasses, honey, cream as well as other non-flammable viscous liquids. They can be found in large sizes to improve handle thick flow. However, gate valves like stainless steel ball valve totally have low-pressure limitations, and so are not optimal in applications which need cleanliness or sanitary conditions.
They are great for use anywhere a shutoff valve should be used. When needed, they could also be used where throttling capabilities are desired, although not generally recommendGate Valve imageed as erosion in the seat and disc occurs as a result of vibrations on the disk in throttling applications.
On additional hand, gate valves remain in the linear motion valve family. Otherwise generally known as the knife valve and the slide valve, the gate valve incorporates a flat or wedge disc that behaves as a gate. This gate or disc controls the flow of fluid within the valve. The gate valve is advisable used once the linear flow of media with less pressure drop is preferred.
It is usually a shut-off valve with throttling capacity. It is intended more for material flow concerning flow regulation. More appropriate for thicker flow media, the flat disc of gate valves makes it easier to reduce through such type of media.
The working of the gate valve is rather simple. When the gate from the valve is lifted on the flow path, the valve opens and if the gate again returns to its position, the gate valve closes. This gate movement is achieved by manually turning the hand-wheel. The hand-wheel rotates the valve stem and also the internal threaded mechanism gives a vertical movement with the gate. As the hand-wheel is turned a couple of full cycle to totally open or fully close the gate valve, they’ve also been known as multi-turn valves. Electrically actuated gate valves are offered but not cost-effective.
Finally, it is very important know how the valve will likely be integrated into the system as well as the type of assembly or installation used, particularly if it needs to be welded, bolted through flanges or screwed in.Once you have determined these different elements, you may focus on the technical characteristics within your installation, specifically the flow and pressure which will allow you to determine the dimensions within your valve.