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When traveling from the cold at an altitude of 30,000 feet to a runway in the desert, rapid temperature change can cause thermal expansion of fluids and potential damage within the system. Thermal relief valves are designed to relieve small volumes of fluid to protect against thermal expansion.

Reduced Pressure Backflow preventerTest Procedure

On the other hand, aircraft are NOT designed nearly so robustly as far as pressures outside being greater than pressures inside. The negative pressure relief valve prevents the generation of sub-atmospheric pressures in the circuit as a result of a discrepancy between the fresh gas flow and the gas evacuation rate (pressure in the cabin from becoming lower than the ambient outside pressure). This situation is rare but can occur when an aircraft descends rapidly and the cabin altitude is still at 8,000 feet (normal condition) but the aircraft itself is lower than that.

RPZBackflow preventerdiagram

A vacuum breaker prevents contamination of your home water supply. Most cities require them at the start of any irrigation system.

RPZ plumbing

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Safety relief valves are designed to be fast-acting components that protect systems with the potential for sudden pressure spikes. These valves may sit dormant for indeterminate amounts of time before needing to be used, so it’s crucial that they always work as intended.

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RPZ valve how it works

In the event of siphon backflow, the pressure on the inlet side drops. The bleeder valve reacts before the differential pressure falls below 140 mbar. The check valves on the inlet and outlet sides close, bleeder valve opens.

Pressure Reducing Valves (PRVs) ensure that an appropriate and comfortable water usage pressure is available at all times.

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RPZ meaning

Aircraft are built to withstand higher pressure on the inside of the aircraft compared to the outside ambient air pressure without damage. However, there is a limit to how much pressure they're designed to take. Thus the positive pressure relief valve opens if the pressure inside becomes greater than desired, so as to keep if from reaching the point where damage could occur. The positive pressure relief valve opens if the cabin pressure is too high in comparison to outside air pressure (pressure differential is higher than 8.85 psi / 0.61 bar). It is most likely to happen when there is a malfunction of the outflow valve (stays closed).

RPZ backflow preventers are based on a three-chamber system with supply pressure, medium pressure and back pressure zones. The differential pressure controllers of the protection cartridge on the inlet side and the check valve (RV) on the outlet side ensure reliability and a high level of safety.

Where are RPZ valves required

Unlike safety relief valves, pressure regulating valves operate more frequently. These valves compensate for momentum forces that upset the normal force balance of typical direct acting valves.

Fluid that represents a health hazard for human beings through the presence of one or more toxic or very toxic substances or one or more radioactive, mutagenic or carcinogenic substances.

Difference between RPZ andbackflow preventer

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Pressure relief valves are a critical component of an aircraft's fuel, hydraulic, and pneumatic systems. These valves serve one of three functions - safety relief, pressure regulation, or protection against thermal expansion.