Mounting; Pressure Connections; Supply Pressure - Emerson Fisher SS-263 Instruction Manual

Instruction Manual
D103542X012

Mounting

The volume booster is mounted to the actuator using the provided mounting adaptor (figure 3) that attaches to the
top or bottom of the piston cylinder using a 1 NPT or 1­1/4 NPT connection and to the SS­263 using a flange­type
connection. For mounting to an ATI piston actuator, a 1­1/4 NPT pipe elbow (key 34) is installed between the
mounting adaptor and piston cylinder. Mounting of the SS­263 to the actuator is typically performed at the factory;
however the following instructions can be used to mount the SS­263 to a Fisher 685 or ATI piston actuator.
Mounting to a Fisher 685 Piston Actuator
1. Apply a suitable thread sealant to the threads of the mounting adaptor (key 29) and thread into the appropriate
1 NPT or 1­1/4 NPT connection port on the actuator.
2. Install O­ring (key 30) into the groove in the mounting adaptor (key 29).
3. Using studs (key 31), lock washers (key 33) and hex nuts (key 32) mount the SS­263 onto the actuator. Tighten hex
nuts (key 32) to 50 ft­lbs.
Mounting to an ATI Piston Actuator
1. Apply a suitable thread sealant to the threads of the 1­1/4 NPT pipe elbow (key 34) and thread into the appropriate
1­1/4 NPT connection port on the actuator.
2. Apply a suitable thread sealant to the threads of the mounting adaptor (key 29) and thread into the 1­1/4 NPT pipe
elbow (key 34).
3. Install O­ring (key 30) into the groove in the mounting adaptor (key 29).
4. Using studs (key 31), lock washers (key 33) and hex nuts (key 32) mount the SS­263 onto the actuator. Tighten hex
nuts (key 32) to 50 ft­lbs.

Pressure Connections

The input signal connection is 1/4 NPT, the supply connection is 1 NPT, and the output connection is 1 NPT or 1­1/4
NPT depending on application. Ensure that the piping is of proper size to meet the capacity demands of the booster
and that the actuator is equipped with properly sized input connections.
The SS­263 includes two 1/4 NPT auxiliary supply connections that allow additional accessories, such as a Fisher 377
trip valve, to be connected to supply pressure. The 3 in 1 connection provides either a 1/4 NPT diagnostic connection,
1/4 NPT actuator bypass assembly connection (for use on an actuator with a handwheel), or a 3/4 NPT dump valve
connection. Consult the appropriate actuator instruction manual for the assembly of the actuator bypass connection.

Supply Pressure

Supply pressure must be filtered clean dry air or noncorrosive gas.
WARNING
If a flammable or hazardous gas is to be used as the supply pressure medium, personal injury, property damage or
equipment damage could result from fire or explosion of accumulated gas or from contact with hazardous gas. The volume
booster has no provision for piping away the vented exhaust gas. Therefore, do not use flammable or otherwise hazardous
gas as a supply medium unless the unit is in a well-ventilated area and all ignition sources have been removed.
SS-263 Volume Booster
September 2019
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