Chapter One: General Information Introduction
5
Chapter One: General Information
Introduction
The Type 653B Exhaust Throttle Valve is designed for a wide range of pressure control
conductance and has the high torque rating necessary for sealing-type and large-size valves. The
653’s motor and gear/driver assembly combined with the Type 651, Type 1651 or Type 652B
Self-Tuning Controller, provides fast and precise pressure control over the entire operating range
of the valve. High accuracy control is attained by micro-stepping the flapper to give more
precise control of the pressure at the desired pressure set point without drift around the set point.
The Type 653 valve has a torque reserve exceeding that which is required to operate a
4-inch sealing valve or a 12-inch non-sealing valve and is constructed of corrosion-resistant 316L
sst. The valve body can be heated up to 150° C (using the appropriate sealing material) without
damaging the motor or drive assembly, thereby allowing for operation in high-temperature
applications and processes. Heating the valve, along with the high torque and corrosion resistant
material of the 653 valve, prevents condensation and deposit buildup that can occur in some of
the most demanding and dirty processes.
The 653 valve has a flapper position indicator to identify valve angle during system
troubleshooting operations. The indicator also acts as a mechanical stop to prevent the flapper
from traveling beyond normal open and closed positions. The Type 653 valve is available in
most common flange styles (ASA, CF, ISO-NW, JIS and KF) to ensure that mating with existing
hardware is an easy operation.
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