Watts M1116 - Manual

8550 Hansen Road • Houston, Texas 77075 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.wattsacv.com
01/05
R
Mustang Series
1
3
2
X
P/L
X X
(AOS)
Y/FC
CLOSES VALVE
OPENS VALVE
FLOW
M116 or M6116 (Globe)
M1116 or M61116 (Angle)
Specifications
The Pressure Relief, Sustaining or Backpressure Control Valve shall be a pilot operated diaphragm valve
designed to permit flow when upstream pressure is above the adjustable setpoint of the control pilot, and
throttle toward closed when upstream pressure falls below the adjustable setpoint.
The main valve shall be a hydraulically operated, single diaphragm actuated, globe or angle pattern valve.
Y-pattern valves shall not be permitted. The valve shall contain a disc and diaphragm assembly that forms
a sealed chamber below the valve cover, separating operating pressure from line pressure. The diaphragm
shall be constructed of nylon reinforced Buna-N, and shall not seal directly against the valve seat and shall
be fully supported by the valve body and cover. Rolling diaphragm construction will not be allowed and there
shall be no pistons operating the main valve or any pilot controls.
The main valve body and cover shall be Ductile Iron ASTM A536, and all internal cast components shall
be Ductile Iron or CF8M (316) Stainless Steel. All Ductile Iron components, including the body and cover,
shall be lined and coated with an NSF 61 Certified Epoxy Coating applied by the electrostatic heat fusion
process. All main valve trim and throttling components (cover bearing, valve seat and disc guide) shall
be Stainless Steel. The valve body and cover must be machined with a 360-degree locating lip to assure
proper alignment.
The disc and diaphragm assembly shall contain a Buna-N synthetic rubber disc with a rectangular cross-
section that is securely retained on 3-1/2 sides by a disc retainer and disc guide. Diaphragm assemblies
utilizing bolts or cap screws for component retention will not be permitted.
The exposed portion of the seat disc shall contact the valve seat and seal drip-tight. The disc and diaphragm
assembly must be guided by two separate bearings, one installed in the valve cover and one concentrically
located within the valve seat, to avoid deflection and assure positive disc-to-seat contact. Center guided
valves will not be permitted. All necessary repairs shall be made from the top of the valve while the body
remains in line.
Pilot control systems for valves 3” and smaller shall contain a Flow Clean Strainer, Adjustable Closing Speed
and Pressure Relief / Sustaining Pilot. Pilot control systems for valves 4” and larger shall contain an external
Y-Strainer, Adjustable Closing Speed, Pressure Relief / Sustaining Pilot and Isolation Ball Valves on all body
connections. All pilot control systems shall utilize copper tubing and brass fittings regardless of valve size.
The adjustment range of the pressure relief / sustaining pilot shall be 20-200 psi.
The valve shall be Watts ACV Model M116 or M6116 (globe) or M1116 or M61116 (angle) pattern Pressure
Relief / Sustaining or Backpressure Control Valve.
PRESSURE RELIEF, SUSTAINING,
or BACKPRESSURE
CONTROL VALVE