Check Valves allow medium to flow in one direction only, stop medium which flow in opposite direction .usually these valve work automatically. Under the action of pressure of fluid which flow in one direction, the disc open. When fluid flow in opposite direction .the fluid is cut down by the pressure of fluid and self-gravity
The check valve include swing type and lift type. For gate valves with working pressures of up to about 800 psi for water supply.
All kidding aside, Velan offers a pretty wide range of valves and has a good reputation. They actually have an engineering staff that knows what they are talking about and should be competitive with other manufacturers of quality valves.
I've since been able to source suitable gate valves due to your help. However, I still have one problem. All the valves I've seen so far come with a rising stem and handwheel. In the open position the wheel may rise to almost 5 feet, for the 10-inch valves for example. Space is critical. The valves will be in chambers about 3 feet deep. Do valves of these sizes and pressure ratings come with non-rising stem and square wrench nuts?

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