Powers 595 Series 11 Self-Operating Temperature Regulators - Type CD Composition Disc User Manual

Powers Accessories for water

Technical Instructions

IS-P-595CD

Table of Contents

■

Valve Description ..............................................................1
Operation ............................................................................1
Speciﬁ cations ....................................................................2
Applications .......................................................................2
Sizing and Selection .........................................................3
Water Capacities .............................................................3
Steam Capacities .............................................................4
Product Identiﬁ cation ......................................................5
Installation ..........................................................................5
Maintenance ......................................................................6
Dimensions .........................................................................8
Parts .................................................................................. 10
Accessories ................................................................... 12
Temp. Ranges/Bulb Sizes ............................................ 12
Order Code ...................................................................... 13
Preventive Maintenance.............................................. 14
Troubleshooting ............................................................. 14
Warranty Information ................................................... 16

#11 Regulator

Single Seat - Bronze Trim - Composition Disc

Valve Description

■

The Powers #11 Regulator is a self-actuating control valve
which automatically controls the temperature of a ﬂ uid
without the use of external power. Adjust the set point and
the rugged self-operating #11 Regulator controls the ﬂ ow
of heating medium (water or steam) to maintain a constant
temperature.

The instrument has a vapor pressure thermal system contain-
ing a thermally responsive ﬂ uid. This thermal system rapidly
senses temperature changes at the bulb and controls the
ﬂ ow of heating medium through the valve to maintain the
desired temperature. The thermal system features a two-ply
brass bellows with six reinforcing ribs on the bellows head
and thick capillary tubing walls to ensure long operating life.

The Powers #11 CD Regulator features:
• Tight shutoff when the valve is closed

• 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 to ease set point adjustments

• A set point reference scale to aid temperature adjustments

Operation

■

A bulb is connected to a bellows containing a thermally
responsive ﬂ uid. The bulb is inserted into the ﬂ uid you are
trying to control (process ﬂ uid) to sense its temperature.
The Regulator set point is adjusted to allow sufﬁ cient ﬂ ow of
heating medium (water or steam) through the valve to keep
the process ﬂ uid at the desired temperature.

(A) When the termperature of the process ﬂ uid drops below
the set point, the temperature of the thermally responsive
liquid 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 from its seat. This
increases the ﬂ ow of the heating medium (water or steam),
which raises the temperture of the process ﬂ uid.

(B) As the process ﬂ uid temperature increases toward or
beyond the desired set point, the temperature of the thermal-
ly responsive ﬂ uid in the bulb increases, which causes the
vapor pressure to increase. This expands the bellows, com-
presses the spring, and moves the valve plug down towards
its seat, to reduce or stop the ﬂ ow of the heating medium.

Temp.

Below

Set Point

Temp.

Above

Set Point

VAPOR

LIQUID

BULB

CAPILLARY

TUBING

SPRING

BELLOWS

VALVE

PLUG

VALVE

PLUG

VALVE SEAT

LIQUID

(A)

(B)