Watts M1113-41 User Manual
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8550 Hansen Road • Houston, Texas 77075 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.wattsacv.com
01/05
R
Mustang Series
PUMP CONTROL VALVE with
RATE-OF-FLOW FEATURE
M113-41 or M6113-41 (Globe)
M1113-41 or M61113-41 (Angle)
Specifications
The Pump Control Valve with Rate-of-Flow Feature shall be a pilot operated diaphragm valve designed to
minimize the surges associated with the starting and stopping of pumps, and automatically limit flow rate
to a constant, adjustable, maximum. The throttling action of the valve shall be controlled by an externally
mounted modulating control pilot which senses differential pressure across a remote mounted orifice plate
(field installed). 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.
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.
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, Rate-of-Flow Control 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 Orifice
Plate Assembly shall be included with the valve and field installed 3-5 pipe diameters downstream of the
Pump Control Valve. The Orifice Plate Assembly shall be (field) connected to the Rate-of-Flow Control Pilot
in accordance with factory piping schematic with minimum 3/8” diameter copper tubing.
The valve shall be Watts ACV Model M113-41 / M6113-41 (Globe) or M1113-41 / M61113-41 (Angle) Pump
Control Valve with Rate-of-Flow Feature.
1
Summary of Contents
Page 1 - Mustang Series
8550 Hansen Road • Houston, Texas 77075 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.wattsacv.com01/05RMustang SeriesPUMP CONTROL VAL
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