Water Temperature Control—Emergency Fixtures—Thermostatic (Rada Z358-20)


Rada Z358-20

Rada Z358-20 has been designed specifically to provide temperature controlled water to emergency fixtures as detailed in ANSI Z358.1-2009.

Z358-20 is a Thermostatic Mixing Valve of “sealed for life”disposable cartridge construction. Compact design and topor bottom blended water outlet make Z358-20 ideal for OEM, new construction and upgrade/retrofit installations.

For Emergency Drench Showers. Rada Z358-20 will pass ANSI specified minimum of 20 gpm/76 lpm (actual 23 gpm/87 lpm) and will flow a minimum of 10 gpm (38 lpm) from direct cold water supply in hot failure mode at 40 psi (2.7 bar) maintained equal inlet supply pressure.

For Emergency Eye Wash Stations. For single or multiplefixture installation, Rada Z358-20 will control accurately atflow rates from 20 gpm (76 lpm) to below 1 gpm (3.8 lpm).

In flow applications between 20 gpm (76 lpm) and 10 gpm(38 lpm), Z358-20 will pass approximately 50% of original flow setting in hot failure mode.

In flow applications between 10 gpm (38 lpm) and 5 gpm (19 lpm), Z358-20 will pass approximately 80% of original flow setting in hot failure mode.In flow applications below 5 gpm (19 lpm), Z358-20 will pass approximately 95% of original flow setting in hot failure mode.

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    Operational Specifications
    • Site Adjustable—Mechanical maximum-temperature limit stop and single-temperature locking features as a function of the temperature control handle design.
    • Thermal shutdown feature is designed to protect user from unsafe water temperatures or hot water/chemical reaction should cold supply be interrupted during use.
    • Unique constant cold water flow design ensures that in the event of a hot supply failure the Rada Z358-20 will allow cold water to flow to fixture.
    • Unique constant cold water flow feature allows the inlet hot water supply to be set within a prescribed range, thus limiting the potential outlet temperature to a safe maximum in the event of misadjustment, unauthorized tampering or thermostat failure. This feature presumes that the correct initial commissioning was performed and that the cold water supply has not been interrupted.