Instruction Manual
D100324X012
1061 F & G Actuator
October 2012
18
Pipe-Away Vent
Some applications require venting of gas from the rotary actuator housing. The 3610 Series positioners vent into the
actuator housing, and from there, the gas has numerous avenues of escape.
WARNING
If a flammable, hazardous, or reactive gas is used as the supply pressure medium, personal injury or property damage could
result from fire or explosion of accumulated gas or from contact with hazardous or r eactive gas.
The positioner on the control valve assembly does not form a gas-tight seal. If the assembly is in an enclosed area, use a
remote vent line, and use other safety measures to adequately ventilate the assembly. A remote vent pipe alone cannot be
relied upon to remove all hazardous gas.
Vent line piping should comply with local and regional codes. It should be as short as possible with adequate inside
diameter and few bends to remove exhaust gases to a ventilated area.
Note
This modification is NOT intended to be a leak-proof or pressure-tight design. It is intended to aid in containing the gas that vents
from the positioner and allow for connection of piping to c arry it away.
The Parts List section, at the end of this manual, provides...
D Retrofit kit numbers to modify an actuator for the vent piping
D Replacement parts for pipe-away v ents
D Retrofit kit numbers for modification of units in the field
Take care that adequate vent pipe size is used. This is particularly important with the larger size actuators with fast
stroking speed requirements. In these situations, large quantities of gas can be vented very quickly through the
positioner, and you must have adequate pipe-away capability. Keep the vent piping as short as possible with few
bends.
Key numbers are shown in figure 7 unless otherwise noted. Refer to the actuator Disassembly and Assembly steps to
gain access to the following parts.
For installation and maintenance of t he pipe-away vent system, be sure to do the following:
WARNING
Perform the steps in the WARNING at the beginning of the Maintenance section.
Refer to instructions in the appropriate valve instruction manual.
Bushings–Remove the mounting yoke bushing (key 67), and the end plate cover bushing (key 31, figures 9 and 11),
then replace them with the pipe-away vent parts. As shown in figure 7, the mounting yoke bushing (key 132) has two
pieces with an O-ring (key 133) between them. The end plate cover repeats the assembly with a two-piece bushing
(key 134) with an O-ring between them (key 135).
Travel Indicator–A gasket (key 136) is placed under the travel indicator plate. Remove the indicator plate (key 37,
figures 8, 9 and 11), install the gasket (key 136) as shown in figure 7.
Housing Vent Plug–A vent is provided in the housing design. To plug this opening, the pipe-away vent kit provides a
hex pipe plug (key 140) for this opening as shown in figure 7. Install the hex plug (key 140) into this opening and
tighten it.
(24 pages)
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