Watts M1114-2 - Manual

8550 Hansen Road • Houston, Texas 77075 • (Ph) 713.943.0688 • (Fx) 713.944.9445 • www.wattsacv.com
01/05
R
Mustang Series
RATE-OF-FLOW VALVE with
PRESSURE REDUCING FEATURE
M114-2 or M6114-2 (Globe)
M1114-2 or M61114-2 (Angle)
Specifications
The Rate-of-Flow Control Valve with Pressure Reducing Feature shall be a pilot operated diaphragm valve
designed to automatically limit flow rate to a constant, adjustable, maximum, and reduce a fluctuating higher
upstream pressure to a constant lower downstream pressure. The flow control action of the valve shall
be controlled by an externally mounted modulating Flow Control Pilot, which senses differential pressure
across a remote mounted orifice plate (field installed). The pressure reducing action of the valve shall be
controlled by a separate Pressure Reducing Control Pilot which internally senses downstream pressure.
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,
Adjustable Opening Speed Control, Pressure Reducing Pilot and Rate-of-Flow Pilot. Pilot control systems
for valves 4” and larger shall contain an external Y-Strainer, Adjustable Closing Speed Control, Adjustable
Opening Speed Control, Pressure Reducing Pilot, Rate-of-Flow 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 reducing pilot shall be 30-300 psi. The Orifice Plate Assembly shall
be included with the valve and field installed 3-5 pipe diameters downstream of the Flow 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 M114-2 / M6114-2 (Globe) or M1114-2 / M61114-2 (Angle) Rate-of-Flow
Control Valve with Pressure Reducing Feature.