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Unidirectional Series
Operation and Maintenance Manual
INSTALLATION
• Valves can be mounted with flow in one direction. Flow directions are indicated on the valve as these would depend
on the application for which the valve is used. However, to enable correct orientation, the seat side of the valve can be
identified with the word “SEAT” marked on the body and on the gate top side.
• On horizontal lines, if there is a possibility of particles/solids settling at the bottom, it is preferable to install the valve so
that the stem is above horizontal/inclined/vertical.
• Install the valve between flanges using fasteners & gaskets.
• Bolt holes in the chest area are always blind tapped and care should be taken not to bottom the bolts while tightening.
Refer to GA Drawing/ Technical Bulletin for quantity and size of blind tapped holes on valve chest area. If the correct
size bolts are not available, use studs and nuts for chest area bolts to avoid damage of body.
Support should be used for valves size 8” and over when installed in vertical pipe. Failure to do so can result in improper
valve operation and/or valve failure.
COMMISSIONING GUIDELINES
• Gland packing is tightened to hold the specified pressure and tested for no leakage before dispatch. However, this may
require some adjustment at site due to loosening in transit etc.
• Check for gland leakage after the valve is subjected to pressure and if any leak is observed, tighten the gland uniformly
in a cris-cross pattern until the leakage stops.
Wrong electrical supply to accessories will damage the equipment. Do not over tighten the gland nuts as this may cause
excessive friction and premature damage to packing.
Cylinder Operated Valves
1. Connect instrument quality air, preferably through an air filter/regulator of adequate size. The recommended air pres-
sure is 80-120 psi (5-8 bar). Refer to the appropriate bulletin/drawing for port and cylinder size details.
2. Ensure the supply air is free from moisture, dirt, and other foreign particles. Drain the filter regulator before operating
the actuator so that pipe rust and dirt if any in the air line will be removed before actuation.
3. If valves are supplied with electrical accessories like limit switch and solenoid valve, ensure wiring is done as per local
electrical safety codes and regulations. Ensure correct electrical supply is given to electrical accessories for proper func-
tioning and safety of the equipment.
4. Open the valve by energizing the solenoid valve/giving air supply to cylinder and operate the valve 2-3 times.
Manual valves
Open/Close the valve manually and observe valve operation.
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