Watts M1115 User Manual
Page 7
Size (in)
1-1/4
1-1/2
2
2-1/2
3
4
6
8
10
12
14
16
Maximum Continuous
(GPM)
95
130
210
300
485
800
1850
3100
5000
7000
8400
11100
Maximum Intermittent
(GPM)
119
161
265
390
590
1000
2300
4000
6250
8725
10500 13300
Minimum Continuous
(GPM)
1
1
1
20
30
50
115
200
300
400
500
650
12541 Gulf Freeway
•
Houston, Texas 77034
•
(Ph) 713.943.0688
•
(Fx) 713.944.9445
•
www.watts.com
M
ustang
s
eries
Specifications
M115 (Globe)
M1115 (Angle)
The Pressure Reducing Control Valve shall be a pilot operated diaphragm valve designed to automatically
reduce a fluctuating higher upstream pressure to a constant lower downstream pressure regardless of vary-
ing flow rates.
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 align-
ment.
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, Fixed Orifice Closing
Speed, Adjustable Opening Speed Control and Pressure Reducing Pilot. Pilot control systems for valves 4”
and larger shall contain an external Y-Strainer, Fixed Orifice Closing Speed, Pressure Reducing 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 valve shall be Watts ACV Model M115 (Globe) or M1115 (Angle) pattern Pressure Reducing Control
Valve.
Other Watts ACV Pressure Reducing Control Valves
M115-3 / M1115-3
Pressure Reducing Valve with Hydraulic Check Feature
M115-7 / M1115-7
Pressure Reducing Valve with Downstream Surge Control Feature
M115-74 / M1115-74 Pressure Reducing Valve with Low Flow By-Pass
910 Ops & Inst