Powers 595 Series 11 Self-Operating Temperature Regulators - Type ST Stainless Trim - Manual (Page 2)

2
Reverse Acting (cooling application)
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(C) When the temperature of the process fl uid rises toward or
above the set point, the temperature of the thermally responsive
fl uid increases, which increases vapor pressure in the bulb/
bellows. The resulting force of the vapor pressure is greater
than the spring force, so the spring contracts and the bellows
expand to push the valve plug downward, away from its seat.
This increases the fl ow of the cooling medium, which lowers the
temperature of the process fl uid.
(D) As the process fl uid temperature decreases toward or below
the desired set point, the temperature of the thermally respon-
sive fl uid decreases, causing the vapor pressure to decrease.
This contracts the bellows and expands the spring to pull the
valve plug up towards its seat, to reduce or stop the fl ow of the
cooling medium.
Specifi cations
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Physical
Valve Sizes: ....................................... 1/2"A, 1/2"B, 1/2"C,
1/2"D, 1/2", 3/4", 1" (NPT)
Body Material: ................................. Bronze
Body Rating: ...................................... ANSI Class 250
Connections: ..................................... Double Female Unions with
Pipe Thread
Style: ................................................... Single Seat, Stainless Steel
Trim, V-Port
Valve Plug Travel: ........................... See Dimensional Data
on page 10
Effective Bellows Area: ................. 7.8 in 2 (50.3 cm 2 )
Maximum Body Temperature: ..... 400°F (204°C)
Operating Temperature
Range: ................................................ See Order Code on page 15
Controlled Medium: ........................ Steam, water and fl uid not
corrosive to stainless steel
and bronze
Maximum Differential Pressure: See Tables on pages 3 & 4
Maximum Allowable
Overheat Temperature: .................. 25°F (14°C) above range
Maximum Well Safe Pressures: . See Table on page 10
Maximum Body Pressure: ............. 250 psi (1723.75 kPa)
Shipping Weight: ............................. See Table 11
Flow Characteristics: ..................... Modifi ed Parabolic
Shutoff Class Rating: ...................... ANSI Class III (Leakage
0.1% of rated valve capacity)
Applications
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Powers #11 Regulators are used to automatically control the
temperature of a fl uid, specifi cally in processes requiring high
pressure steam (up to 200 psi). The self-actuated Regulator can
easily be installed in any convenient location. Among its applica-
tions are: hot water systems, fuel oil heaters, control for jacket
water cooling for air compressors, dairy equipment, and many
industrial processes. Below are two typical applications.
#11 Regulator ST
Single Seat
DIRECT ACTING
#11 Regulator WM
Water Mix
Bulb in Well
Bulb in Well
Steam
Supply
Pump
Pump
Check
Valves
Cold Water Supply
HTHW Return
WATER HEATER
Tempered
Return
HTHW
Tempered
Water
To Condensate Return
Quench Tank Application
Jacket Water Cooling Application
#11 Regulator
Single Seat ST
REVERSE ACTING
Surge Tank
Engine
or
Compressor
Circulating
Pump
Cold Water
Inlet
Overflow
Bulb in Well