Residual pressure valve

From GAWDAwiki

Definition 1: (RPV’s) sometimes called Positive Flow Valves, are typically of Brass construction. RPV’s are high pressure cylinder valves with a built in check valve that retains approximately 30–50 psig in the cylinder. This prevents backflow contamination when cylinder pressure gets below the customer’s system pressure. RPV’s also prevent atmospheric contamination if a customer leaves the valve open when the cylinder is empty.

RPV Nipple with retractable pin.

residual pressure valve.

These vales have a Maximum design pressure of 2400 psig and require the fill location to have special pinned nipples to vent and fill cylinders with these valves. RPV’s can be used for both industrial and specialty applications. They also allow the option to eliminate venting & vacuuming of cylinders from the fill cycle.^[1]

Definition 2: A residual pressure valve is a valve intended to maintain pressure in disc brake calipers, which increases brake efficiency.^[2]

Residual pressure valves are normally used in drum brake systems. These valves maintain a slight static pressure in the hydraulic system at all times, even when the brake pedal is released.