What type of valve is used in Symmons showers is primarily the pressure-balancing valve, specifically the Symmons Temptrol pressure-balancing valve which Symmons invented in the 1960s and is its signature technology. Symmons Industries, founded in 1939 in Braintree, Massachusetts, invented the first pressure-balancing shower valve to prevent scalding when toilets flush or other fixtures cause pressure drops. The Temptrol valve uses a spindle and piston mechanism that balances hot and cold water pressure to maintain temperature within plus or minus 3 degrees Fahrenheit, meeting ASSE 1016 anti-scald standards. This valve is made in USA from solid brass, is rebuildable, and lasts 30 to 50 years. Symmons also makes thermostatic valves in its Allura line, which combine pressure-balancing with thermostatic control for more precise temperature control within 1 degree, ideal for luxury showers, costing $150 to $300. Symmons valves include pressure-balancing only and pressure-balancing plus thermostatic options, with flow rates of 1.5 to 2.5 GPM. All Symmons shower valves are pressure-balancing at core, unlike older non-pressure-balancing valves that could scald. So type used is Temptrol pressure-balancing valve, with thermostatic option in Allura, both preventing scalding and maintaining temperature, made in USA, solid brass, rebuildable, commercial-grade.
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