Powers 595 Series 11 Self-Operating Temperature Regulators - Type WM 3-Way Water Mix - Manual

The Powers #11 Water Mix Regulator is a self-actuating control valve which auto-
matically maintains a mixture of hot and cold water at the desired set point without
the use of external power. Adjust the set point and the rugged self-operating #11
Regulator controls the mix of hot or cold water to maintain a constant temperature.
The instrument has a vapor pressure thermal system containing a thermally respon-
sive fluid. This thermal system rapidly senses temperature changes at the bulb and
accordingly positions the valve disc or plug, regulating hot and cold water flow to
maintain the desired set point. The thermal system features a two-ply brass bellows
with six reinforcing ribs on the bellows head and thick capillary tubing walls to insure
long operating life.
The Powers #11 WM Regulator features:
• Tight disc shutoff when either of the two inlet ports are closed (up to 2")
• EPT disc is replaceable (on 1/2"-2" valves).
• Lower guide stabilizes valve plug, assisting shutoff and modulation.
• EPT spring loaded V-ring packing provides good sealing and long life.
• A valve stem of highly polished corrosion resistant grade 316L stainless steel to
decrease friction and reduce hysteresis.
• An adjusting nut mounted on ball bearings and a removable set point adjusting
rod ease set point adjustments
• A set point reference scale aids temperature adjustment.
The #11 Regulator should be installed with
the hotter of the two liquids going into the
bottom ‘B’ port and the cooler liquid going
into the upper ‘U’ port.
(A) When the temperature of the mixed liquid
drops below the set point, the temperature of
the thermally responsive fluid decreases,
which decreases the vapor pressure in the
bulb/bellows. The force of the resulting vapor
pressure is less than the spring force, so the
bellows contract and the spring extends,
which raises the valve plug up to decrease
flow through the upper ‘U’ port (cold) and
increase flow through the bottom ‘B’ port
(hot). This raises the temperature of the flow
out of the common ‘C’ port toward the set
point.
(B) As the temperature increases toward or
beyond the desired set point, the tempera-
ture of the thermally responsive fluid in the
bulb increases, which causes the vapor pres-
sure to increase. This expands the bellows,
compresses the spring, and moves the valve
plug down to increase flow through the upper
‘U’ port (cold) and decrease flow through the
bottom ‘B’ port (hot). This lowers the temper-
ature of the flow out of the common ‘C’ port
toward the set point.
Temp.
Below
Set Point
Temp.
Above
Set Point
U C
B
U C
B
VAPOR
LIQUID
BULB
CAPILLARY
TUBING
SPRING
BELLOWS
VALVE
PLUG
LIQUID
VALVE PLUG
SEATS
VALVE
PLUG
VALVE PLUG
SEATS
Cold Mixed
Hot
Cold Mixed
Hot
Valve Description ......................1
Operation ....................................1
Applications ................................2
Specifications..............................3
Sizing and Selection ..................3
Maximum Water Capacities ......4
Product Identification ................5
Installation ..................................5
Maintenance ..............................6
Preventive Maintenance ............9
Troubleshooting ........................9
Dimensions................................10
Parts List ..................................12
Accessories ..............................14
Temp. Ranges/Bulb Sizes ........14
Ordering Code ..........................15
Warranty Information ................16
(B) (A)
VALVE DESCRIPTION TABLE OF CONTENT
OPERATION
TECHNICAL INSTRUCTIONS
#11 REGULATOR 3-Way Water Mix (Type WM)
IS-P-595WM