Watts MG User Manual
For Steam Main Drip and Process Applications
ES-G/MG
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Series G, MG
Float & Thermostatic Steam Traps
Sizes: 3⁄4" – 2" (20 – 50mm)
For operating pressures up to 50psi (3.5 bars)
Series G, MG Float & Thermostatic Steam Traps are designed
for use on modulating process equipment and as main distribution line drip traps. Series G, MG Float & Thermostatic steam
traps feature a straight through design for fast simple installation.
Stainless steel valve head and seats provide long service life.
G, MG series steam traps have excellent air venting capability
and discharge condensate at near to steam temperature so
the steam space remains free of condensate providing
improved steam system efficiency.
Features
• Fail safe — In case of float failure, trap will discharge
condensate and air; no unit freeze-up
• Air vent parts — accessible without disturbing piping
• Inlet baffle — breaks up water hammer; prevents
damage to parts
• Snap action valve — no wire-drawing or valve chatter
• Two moving parts — no levers, hinges or pins to corrode
or jam
• Straight-through connections — saves installation time,
labor, space, headroom
• Stainless steel valve head and seats
• Seamless copper float — no seams to develop leaks
• Uniform operations — not affected by changes in load
or pressures
• Condensate valve rotates — ensures even wear, longer
valve and seat life
Applications
• Steam coils
• Unit heaters
• Drip points
• Heat exchangers
• Water heaters
• Absorption machines
• Unit ventilators
• Air handlers
• Make-up air coils
• Re-heat coils
• Jacketed kettles
Specifications
The float & thermostatic steam trap shall be installed as indicated on the plans. The trap body and cover shall be manufactured out of cast iron, the diaphragm cover shall be forged
brass, the diaphragm shall be duplex phosphor bronze type
with stainless valve cone, the condensate valve and seats
shall be hardened stainless steel and the float shall be manufactured out of seamless copper. The trap shall have straight
through pipe connections, the air vent shall be serviced without breaking pipe connections and should be an open float
design. The steam trap shall be a Watts Regulator Company
Series G, MG, float and thermostatic type.
Models
Model G-15 — 25" Hg to 15psi (1.05 bars)
Model MG-30 — 25" Hg to 30psi (2.1 bars)
Model MG-50 — 25" Hg to 50psi (3.5 bars)
3
⁄4" 6G
Watts product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements,
please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials without prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
Dimensions — Weights
A
F
INLET
OUTLET
D
C
B
Materials:
Body and Cover: Cast iron (Class 125)
Diaphragm Cover: Forged brass
Diaphragm: Duplex phosphor bronze type with stainless steel
valve cone
Condensate Valve: Hardened stainless steel
Seats: Hardened stainless steel
Float: Seamless copper
Finish: Rust preventive enamel
MODEL TAPPING (NPT) DIMENSIONS WEIGHT
ABCDF
in. mm in. mm in. mm in. mm in. mm n. mm lbs. kgs.
6G-15
3
⁄4 20 41⁄2 114 61⁄2 165 41⁄2 114 415⁄16 125 17⁄8 48 6 152
7G-15 1 25 51⁄2 140 71⁄2 191 51⁄2 140 55⁄8 143 21⁄16 52 9 229
8G-15 11⁄4 32 51⁄2 140 8 203 6 152 51⁄2 140 2 51 12 305
91G-15 11⁄2 40 75⁄8 194 113⁄4 298 89⁄16 217 91⁄16 230 23⁄16 71 39 991
101G-15 2 50 95⁄16 237 1313⁄16 351 103⁄8 263 1015⁄16 278 23⁄8 60 59 1499
111G-15 2 50 103⁄8 264 151⁄4 387 115⁄8 295 117⁄8 302 23⁄4 70 85 2159
7MG-30 1 25 51⁄2 140 71⁄2 191 51⁄2 140 55⁄8 143 21⁄16 52 9 229
8MG-30 11⁄4 32 51⁄2 140 8 203 6 152 51⁄2 140 2 51 12 305
91MG-30 1
1
⁄2 40 75⁄8 194 113⁄4 298 89⁄16 217 91⁄16 230 23⁄16 71 39 991
101MG-30 2 50 95⁄16 237 1313⁄16 351 103⁄8 263 1015⁄16 278 23⁄8 60 59 1499
111MG-30 2 50 103⁄8 264 151⁄4 387 115⁄8 295 117⁄8 302 23⁄4 70 85 2159
6MG-50
3
⁄4 20 41⁄2 114 61⁄2 165 41⁄2 114 415⁄16 125 17⁄8 48 6 152
7MG-50 1 25 5
1
⁄2 140 71⁄2 191 51⁄2 140 55⁄8 143 21⁄16 52 9 229
8MG-50 11⁄4 32 51⁄2 140 8 203 6 152 51⁄2 140 2 51 12 305
91MG-50 1
1
⁄2 40 75⁄8 194 113⁄4 298 89⁄16 217 91⁄16 230 23⁄16 71 39 991
101MG-50 2 50 95⁄16 237 1313⁄16 351 103⁄8 263 1015⁄16 278 23⁄8 60 59 1499
111MG-50 2 50 103⁄8 264 151⁄4 387 115⁄8 295 117⁄8 302 23⁄4 70 85 2159
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