Early steam locomotives therefore used a simpler arrangement of weights stacked directly upon the valve. , Weighted valves were sensitive to bouncing from the rough riding of early locomotives.
Compared to pneumatic control valves with standard fail-safe action, actuators equipped with these innovative safety devices are able to maintain the fail-safe position over an extended period of time when exposed to fire. p. 22.
However guides below will help you to select fail position of control valve. LPSV and VPSV are spring-operated or weight-loaded. The test valve described was heated in a test room according to the unit-temperature curve.  Early safety valves were regarded as one of the engineman's controls and required continuous attention, according to the load on the engine. in the event of failure (fail open design). They can be set to fail open, where the valve automatically reverts to the open position when power to the actuator is lost.
This gives a steam flow through the valve equivalent to a valve one and a half or twice as large (depending on detail design).
The design of this irreversibly operating cartridge is simple and allows retrofitting of already installed pneumatic actuators.
It will solve the problem that if a valve is actuated to open and then actuated to close,it will fail in whichever position it is when the actuator is de-engerized. Practically, this can have the same result as failing open, but fail safe is often achieved through addition of a separate device, known as a bypass switch. the matter that has been injected into the gauge, if over pressurised, will be diverted through a pipe in the safety valve, and shall be driven away from the gauge.
Coatings cannot sufficiently retard the loss of force either. The two general types of protection encountered in industry are thermal protection and flow protection. On the Stockton and Darlington Railway, the safety valve tended to go off when the engine hit a bump in the track. A little more than a decade ago the problems discussed above were solved with the development of a thermostatic cartridge system.
As boiler diameter increased, some forms were even set inside the boiler shell, with the springs housed in a recess inside and only the valves and balance lever protruding outside.  This was encouraged by them being fitted with easily adjustable wing nuts, the practice of adjusting the boiler's working pressure via the safety valve being an accepted behaviour well into the 1850s. Fail Safe Close Manual Ball Valves play a key role in many on-site applications, being a firm favourite with engineer's and installers alike!.
pression d'alimentation nécessaire doit être supérieure de 0,2 bar à la valeur finale de la plage de pression nominale.
Papin retained the same design for his 1707 steam pump.
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