M200 Series:Double Check Valve Assemblies
M300 Series:Double Check Detector Assemblies
M400 Series:Reduced Pressure Zone Assemblies
M500 Series:Reduced Pressure Detector Assemblies
M200/M300 - In normal flowing operation, the independent check valves remain closed until there is a water demand. Each check will then open and maintain an approximate 1 PSI differential in the direction of flow. In a nonflow or backflow condition, both checks will close until the resumption of normal flow.
M400/M500 - In normal flowing operation the independent check valves will be open and the pressure differential relief valve located between the two check valves, the area called the zone, will automatically open and close to maintain the zone pressure at least 2 PSI lower than the inlet pressure. If demand for flow stops, the differential pressure relief valve will automatically open and discharge water to maintain the zone at a pressure of 2 PSI lower than the inlet pressure. After the pressure differential is reestablished, the differential pressure relief valve will automatically close.
Double Check Valve Assemblies are used to prevent backflow of pollutants that are objectionable but not toxic, double checks may be installed under continuous pressure service and may be subjected to backpressure. Double checks can be used in fire protection systems without chemical additives, protection of industrial in-plant plumbing systems and other systems requiring low-hazard protection. Local codes may vary, consult authorities for specific approved applications.
Double Check Detector Assemblies are used to prevent backflow of pollutants that are objectionable, but not toxic. Double checks may be installed under continuous pressure service and may be subjected to backpressure. The Double Check Detector assembly is used primarily on fireline sprinkler systems when it is necessary to monitor unauthorized use of water.
Reduced Pressure Zone Assemblies (RP's) provide protection to the potable water system from contamination in accordance with national plumbing codes. RP's are normally used in high-hazard applications for protection against both backsiphonage, backpressure and the fiouling of either check valve.
Reduced Pressure Detector Assemblies (RPDA) are installed on fire protection systems connected to the public water supply in a high-hazrd application. In addition to the featutres of the Maxim 400, the Maxim 500 is used to monitor unauthorized use of water from the fire protection system.
M200/M300 - The Backflow Assembly shall consist of two independent Link-check modules within a single housing with sleeve access, required test cocks and drip tight shut-off valves. Link-checks may be removed and reinstalled in housing, without any special tools. The housing shall be constructed of 300 series stainless steel with groove end connections. Link-checks shall have reversible elastomer disks and in operation shall produce drip tight closure against the reverse flow of liquid caused by backpressure or backsiphonage. Device shall be an Ames Fire & Waterworks Maxim 200 or 300 series.
M400/M500 - The Reduced Pressure Backflow Assembly shall consist of two independent Link check modules, a differential pressure relief valve located between and below the two modules, drip tight inlet and outlet shutoff valves, and required test cocks. Both check modules and the relief valve shall be contained within a sleeve accessible single housing constructed from 300 series stainless steel with groove end connections. Link checks shall have reversible elastomer disks and in operation shall produce drip tight closure against the reverse flow of liquid caused by backpressure or backsiphonage. Assembly shall be an Ames Fire & Waterworks Maxim 400 or 500 series.
- Extremely Compact Design
- Certified lowest pressure loss
- 70% lighter than traditional designs
- Entire valve body and closure sleeve manufactured from 304 (schedule 40) stainless steel
- Available with UL/FM gate valve or UL/FM butterfly valve end connections
- Approved for horizontal, vertical or "N" pattern installations. M400 & M500 available in "Z" pattern as well
- Groove fittings allow integral pipeline adjustment
- Patented link-checks provide low pressure loss
- Unmatched ease of serviceability
- Replaceable check disc rubber
Characteristics and MaterialRated Working Pressure:
- 175 PSI
- 33F - 110F
- 300 Series Stainless Steel
- Groove per AWWA C-606 (IPS) or Flange per ANSI B16.1, Class 125
M200/M300 Series Downloads
- Brochure - Maxim 200/300
- Installation Sheet - Maxim 200/300
- Specification Sheet - Maxim 200
- Specification Sheet - Maxim 200(a)
- Specification Sheet - Maxim 300
- Specification Sheet - Maxim 300(a)
M400/M500 Series Downloads
- Brochure - Maxim 400/500
- Installation Sheet - Maxim 400/500
- Specification Sheet - Maxim 400
- Specification Sheet - Maxim 500
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