3
b. Make certain valve is in the open position before applying heat. Check
valves may be in the closed position.
c. Welding should be performed by a qualified welder using the correct
welding equipment and following an acceptable procedure.
d. After completion of the weld, it should be stress relieved if required by the
welding procedure and subjected to a pressure test to ensure a sound
weld.
5. POST INSTALLATION
A. After installation of the valve, the line should be flushed or blown out to remove dirt
and foreign objects.
B. Check for tightness of body/bonnet joint.
C. Pressure test the joint to prove quality of flange bolting, welding, etc.
Note:
Use of caustics or other chemical agents to flush pipe and valve may
require the removal of the valve packing and gasket based on compatibility
of flushing agent, gasket and packing material.
6. MAINTENANCE & TROUBLE SHOOTING
Valves do not need much attention, but to assure the best operating life and a lower
incidence of maintenance, a program for periodic inspection should be established.
Items to check on a periodic basis are:
A. Glands should be kept tight to prevent leakage. Avoid over-tightening stuffing nuts
or stuffing box packing. This excessively compresses the packing, which
considerably shortens its life and increases operating torque. The gland should
be only as tight as is necessary to seal.
B. Observe valve for leakage taking special note of the body/bonnet joint area, the
end connections and the pressure retaining shell. If leakage at the body/bonnet
joint is evident, check tightness of bolts.
If leakage is at the end connections, check the tightness of the flange bolts in a
flanged valve or the weld in a welded valve.
After determination of joint tightness and leakage is still evident, the joint must be
disassembled and the gasket replaced and/or sealing surfaces repaired.
C. Ensure integrity and cleanliness of fusible link and exposed hinge pins as well as
ensuring that the spring is unobstructed and correctly operating.
Note: Use of a tacky lubricant can pick up abrasive particles. Dry film lubricants
are preferred.
INSTALLATION, OPERATION AND
MAINTENANCE MANUAL
263 Cox Street
Roselle, New Jersey 07203
ESOV(
EMERGENCY SHUTOFF VALVES
)
1 800
899-0553
sales
@
aa-fs.com
www.
assuredautomation
.com
Doc No.IOM 2010
Rev
01
