Non-rising stems are usually threaded into your upper part with the gate and also have a pointer threaded on the top to indicate position. Non-rising stem designs of forged steel gate valve are ideally best for applications where vertical space is bound, in well applications and where scraping/pigging is not required.Gate valves are made with a sealing unit to supply a tight seal about the stem. Our unique Single Loaded Spring (SLS) stem seal design, used exclusively on WKM Saf-T-Seal and Pow-R-Seal gate valves, provides superior leak protection along with a self-adjusting seal meant to reduce maintenance.
A resilient seated gate valve features a plain valve bottom allowing free passage for sand and pebbles from the valve. If impurities pass because valve closes, the rubber surface will close across the impurities even though the valve is closed. A high-quality rubber compound is soft enough to absorb impurities, yet sufficiently strong to wash the impurities through if the valve is opened again. This means that the rubber surface will regain its original shape securing a drop-tight sealing.
Again, while using difference between ball valves and gate valves being structural, gate valves operate differently from ball valves. They control flow using a gate, which is lifted out from the way of fluid or another materials. The gate is usually round or rectangular. Operators control the valve typically by turning a knob to lift or lower the gate thereby, control flow.
Gate valves will not offer the same immediate turn off capabilities of your ball valve, that is one in the main differences. However, they certainly offer more finely tuned control of the flow of materials, and also over the pressure in the flow. There is no immediate shut off that has a gate valve, playing with applications where that's not needed but a higher degree of control is, these are a better option when compared to a ball valve.