Instruction manual

Instruction Manual
D500248X012
A31D Valve
April 2014
3
Installation
Recommended or ”preferred” installation for the A31D valve is with the flow into the shaft side of the disk (retaining
ring downstream from the high pressure side of the valve).
The standard soft seal and standard Phoenix III seal offer ANSI/FCI 70-2 Class VI, bidirectional shutoff. The Phoenix III
seal for fire-tested applications must be installed in the preferred direction. The Novex seal is unidirectional and should
be installed in the preferred direction. See table 3.
For assistance in selecting the appropriate combination of actuator action and open valve position, consult your
Emerson Process Management sales office.
WARNING
To avoid personal injury or property damage resulting from the sudden release of pressure:
D Always wear protective gloves, clothing, and eyewear when performing any maintenance operations to avoid personal
injury.
D Do not install the valve assembly where service conditions could e xceed the limits given in this manual or on the
nameplates.
D Use pressure-relieving devices as required by government or accepted industry codes and good engineering practices
to protect from over-pressurizing the system.
D Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
D If installing into an existing application, also refer to the WARNING at the beginning of the Maintenance section in this
instruction manual.
CAUTION
When ordered the valve configuration and construction materials were selected to meet particular pressure, temperature,
pressure drop, and controlled fluid conditions. Responsibility for the safety of process media and compatibility of valve
materials rests solely with the purchaser and end-user. Since some body/trim material combinations are limited in their
pressure drop and temperature range capabilities, do not apply any other conditions to the valve without first contacting
your Emerson Process Management sales office.
1. Isolatethecontrolvalvefromthelinepressure,releasepressure from both sides of the valve body, and drain the
process media from both sides of the valve. If using a power actuator, shut off all pressure lines to the power
actuator, release pressure from the actuator, and disconnect the pressure lines from the actuator. Use lock-out
procedures to be sure that the above measures stay in effect while you are working on the equipment.
WARNING
See the WARNING at the beginning of the Maintenance section for more information before removing the valve from the
pipeline.
2. Install a three-valve bypass around the control valve assembly if continuous operation is necessary during
inspection and maintenance of the valve.
3. Inspect the valve to be certain that it is free of foreign material.