Ball valve has an exceptionally strong chlorine corrosion resistance, suitable
temperature conditions in the -20-150 ℃, long-term transport any
concentration of acid, alkali, salt liquid medium. Long service life,
aging, toxin-free advantages of both the strength of carbon steel shell,
but also corrosion-resistant materials in lined, oil, chemicals,
rubber, plastics, pharmaceuticals, paper making, electroplating,
metallurgy, etc. Ideal for many industries. Scope: Urban, chemical,
metallurgy, petroleum, pharmaceutical, food, beverage, environmental
protection.
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?
From the original1GateValve.
The
safety valve in handling not only complaints but people is to allow
others to talk themselves out!  They know more about their situation
than you do. So ask questions and let them tell you a thing or two. If
you disagree, do not interrupt as it is dangerous. They will not listen
to you, at all, since they still have their own ideas crying out for
expression.  Encourage them to express their ideas fully.

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