Watts M1113-29 User Manual
R
PUMP CONTROL VALVE with
PRESSURE REDUCING FEATURE
01/05
Mustang Series
M1113-29 or M61113-29 (Angle)
Specifications
The Pump Control Valve with Pressure Reducing Feature shall be a pilot operated diaphragm valve designed
to minimize the surges associated with the starting and stopping of pumps, and automatically reduce pump
outlet pressure to a constant lower downstream pressure regardless of varying flow rates. The valve shall
be designed to open at an adjustable rate upon pump start-up, and close at an adjustable rate upon pump
shut-off. When the valve is near closed the limit switch shall be tripped, turning the pump off. The pump
shall start and stop against a closed valve. The valve shall have provisions for manual operation in the event
of power outage. Solenoid voltage shall be _________ and enclosure shall be NEMA 4 General Purpose.
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.
M113-29 or M6113-29 (Globe)
The disc and diaphragm assembly shall contain a Buna-N synthetic rubber disc with a rectangular crosssection 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.
The pilot control system shall contain a 3-Way Solenoid Pilot with screw type Manual Operator, Single Limit
Switch, 3-Way Accelerator Pilot with integral orifice, Pressure Reducing Pilot, separate Adjustable Opening
and Closing Speed Controls, (2) Check Valves, an external Y-Strainer and Isolation Ball Valves on all body
connections. The pilot control system shall utilize copper tubing and brass fittings. The adjustment range of
the pressure reducing pilot shall be 30-300 psi.
The valve shall be Watts ACV Model M113-29 / M6113-29 (Globe) or M1113-29 / M61113-29 (Angle) Pump
Control Valve with Pressure Reducing Feature.
8550 Hansen Road • Houston, Texas 77075 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.wattsacv.com
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