Priming valve

(Steam Eng.) a spring safety valve applied to the cylinder of a steam engine for discharging water carried into the cylinder by priming.

See also: Priming

References in periodicals archive ?
* No fuel is leaking under the heater, at the priming valve, the gravity feed adapter or the fuel control valve quick-disconnects.
Wanner Engineering will introduce HydraCell C80 Series air-bleed priming valves at booth D-4770.
The C80 Series Airbleed Priming Valves automatically open to allow F/G-20 through D/G-12 Series pumps to self-prime by quickly relieving the system of trapped vapors or air rather than compressing the gas and causing pump airlock.