Specifications - 4000SS
The Reduced Pressure Zone Assembly shall consist of two independently operating, spring loaded cam-check valves with a hydraulically operated differential pressure relief valve located between and below the cam-checks, required test cocks and optional inlet and outlet resilient seat shutoff valves. When normal flow exists, both checks, called the zone, is at least 2 PSI lower than the inlet pressure. The differential pressure relief valve is closed during the normal flow.

If cessation of normal flow occurs, the differential pressure relief valve will automatically open and discharge to maintain the zone at least 2 PSI lower than the inlet pressure. This action will prevent a backflow or backsiphonage condition. After the required differential is established, the differential pressure relief valve again closes.

The cam-checks include a stainless steel spring and cam-arm, rubber faced disc and a replaceable seat. The body shall be manufactured from 300 series stainless steel, lead free through the waterway, with a single two-bolt grooved style access cover. No special tools shall be required for servicing. The relief valve shall be compact with a rolling diaphragm and no sliding seals. The relief valve shall discharge in a 360º radius. The Reduced Pressure Zone Assembly shall be an Ames Fire & Waterworks 4000SS series.

Specifications - 5000SS
The Reduced Pressure Detector Assembly shall consist of two independently operating, spring loaded cam check valves with a hydraulically operated differential pressure relief valve located between and below the cam checks, required test cocks, bypass assembly and inlet and outlet resilient seat shut off valves. When normal flow exists, both check valves are open and the pressure in the area between the checks, called the zone, is at least 2 PSI lower than the inlet pressure. The differential pressure relief valve is closed during normal flow.

If cessation of normal flow occurs, the differential pressure relief valve will automatically open and discharge to maintain the zone at least 2 PSI lower than the inlet pressure. This action will prevent a backflow or backsiphonage condition. After the required differential is established, the differential pressure relief valve again closes.

The cam checks include a stainless steel spring and cam arm, rubber faced disc and a replaceable seat. The body shall be manufactured from 300 series stainless steel, lead free through the waterway, with a single two-bolt grooved style access cover. No special tools shall be required for servicing. The relief valve shall be compact with a rolling diaphragm and no sliding seals. The relief valve shall discharge in a 360º radius. the bypass line consists of a small diameter reduced pressure zone assembly, water meter and shut-off valves. The Reduced Pressure Detector Assembly shall be an Ames Fire & Waterworks 5000SS series.