Reduced pressure principle backflow preventer definition

Reduced pressure principle backflow preventer means a device composed of two (2) tightly closing shutoff valves surrounding two (2) independently acting pressure reducing check valves that, in turn, surround an automatic pressure differential relief valve, and four (4) test cocks, one (1) upstream of the five (5) valves and one (1) between each of the four (4) check and shutoff valves. The check valves effectively divide the structure into three (3) chambers. Pressure is reduced in each downstream chamber allowing the pressure differential relief valve to vent the center chamber to the atmosphere should either or both check valves malfunction.

Reduced pressure principle backflow preventer means a type of cross connection control assembly which contains 2 consisting of two independently acting check valves, internally force loaded to a normally closed position and separated by an intermediate chamber or zone in which there is a hydraulically operated relief means for venting to atmosphere, internally force-loaded to a normally open position. These assemblies are designed to operate under continuous pressure conditions. The assembly shall include two properly located, tightly closing and includes 2 shut-off valves and 4 four properly located test cocks.

Reduced pressure principle backflow preventer means a type of cross connection control device which contains 2 independently acting check valves, separated by an intermediate chamber or zone in which there is a hydraulically operated means for venting to atmosphere, and includes 2 shut−off valves and 4 test cocks. The term “RP” has the same meaning as reduced pres- sure principle backflow preventer.

Reduced pressure principle backflow preventer means a device composed of two (2) tightly closing shutoff valves surrounding two (2) independently acting pressure reducing check valves that, in turn, surround an automatic pressure differential relief valve, and four (4) test cocks, one (1) upstream of the five (5) valves and one (1) between each of the four

Reduced pressure principle backflow preventer means an assembly consisting of two independently operating approved check valves with an automatically operating differential relief valve located between the two check valves, and resilient-seated or ball shut-off valves on each side of the check valves, plus properly located test cocks for the testing of the check valves and the relief valve.

Reduced pressure principle backflow preventer. (RPD) means a device containing within its structure a minimum of two independently acting, approved check valves, together with an automatically operating pressure differential relief valve located between the two check valves. The first check valve reduces the system pressure a predetermined amount so that during normal flow and a cessation of normal flow the pressure between the checks shall be less than the system pressure. In case of leakage of either check valve, the differential relief valve, by discharging to atmosphere, shall operate to maintain the pressure between the checks less than the system pressure. The unit shall include tightly closing shut-off valves located at each end of the device and each device shall be fitted with properly located test cocks;

Reduced pressure principle backflow preventer means a device composed of two

Reduced pressure principle backflow preventer means a cross connection control assembly consisting of 2 inde- pendently−acting check valves, internally force−loaded to a nor- mally closed position and separated by an intermediate chamber or zone in which there is a hydraulically operated relief means for venting to atmosphere, internally force−loaded to a normally open position. These assemblies are designed to operate under continu- ous pressure conditions. The assembly shall include 2 properly located, tightly closing shut−off valves and properly located test cocks.

Reduced pressure principle backflow preventer. (RPD) means a device