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 original1GayeValve.
The machinery systems on board ship consist of several safety
features for safe and smooth operation of the ship and also for the
safety of its personnel. Relief valve is one such important safety
device which is used in almost all the machinery systems which deal with
extremely high pressures. These high pressures often tend to go over
the predetermined limits and the over pressure thus created is the
pressure just above the maximum allowable working pressure (MAWP) or
designed working pressure.

There are systems onboard a ship which are operated by pneumatics or
hydraulics and sometimes even air or electronics. For this reason, the
relief valve by construction and operation should be such that even in
case of failure of the control system, relief valve must lift to
safeguard the system from over pressurized。
How Relief Valve Operates?
The relief valve operates by the action of spring which is determined
by an operating pressure. The opening pressure of the spring can be
adjusted by an adjusting screw provided on top of the relief valve. The
spring acts opposite to the direction of the pressure and thus during
normal operation of the machinery, the spring tension will not allow the
valve to operate.

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