What does a 350 PSI shell test mean on a brass ball valve?
Short answer: A shell test checks that the valve body does not leak or break under water pressure. A seat test checks that a closed valve holds back pressure without leaking past the ball.
The numbers
- Shell test: 25 kg/cm2, about 350 psig (pounds per square inch, gauge).
- Seat test: 16 kg/cm2, about 225 psig.
- 1 kg/cm2 is about 14.2 psi. These are test pressures, not the pressure a valve works at every day.
- M-Tech Valves brass ball valves from 15 mm to 32 mm are tested at these pressures.
Shell test: body strength
Pressure is applied inside the valve body. The body and joints must show no leak and no damage. A weak casting or a porous body fails here.
Seat test: sealing
The valve is closed and pressure is applied on one side. The seat must stop water from passing to the other side. A worn or badly fitted seat fails here.
Why ask for both numbers
A valve can pass a body test but still leak when closed. Asking for the shell and seat figures helps you compare valves fairly.
Warranty and quotes
All M-Tech Valves products carry a 5-year warranty for breakage and leakage. A defective valve is replaced piece to piece.
Call or WhatsApp +91 77550 01116 for a quote. Minimum order 200 pieces per carton, ex-factory pricing.
See our brass ball valve 25 mm or the full range at www.m-techvalves.com.