Installation, Operation and Maintenance Manual
XXXXXXXX Rev. 1
July 2016
6
Section 4: Installation
Installation
Section 4: Installation
4.1
Mounting Types
The AT Series gearbox can be installed onto the valve in two different ways:
1.
DIRECT MOUNTING
-- This involves mounting the gearbox directly on the valve
stem and valve mounting flange.
2.
BRACKET MOUNTING
– This involves installing the bracket on the valve flange.
The AT Series Gearbox is mounted on the bracket and is coupled to the valve stem
with a coupling.
Following procedure should be followed while installation of AT Series gearboxes onto
valve systems:
1.
The valve and gearbox should be in the same position i.e. completely ‘open’ or
completely ‘closed’ position, at the time of installation. Any exception to this will
cause a condition wherein the person operating the valve might try to open the
valve with a gearbox which is already in open position. This will lead to excessive
torque on the worm and worm wheel assembly which might lead to excessive
wear / breakage of internals.
2.
The gearbox should be positioned in such a way so that “clockwise rotation of
hand wheel gives clockwise rotation of output to close the valve”.
3.
Check whether the mounting dimensions (stem dia. and mounting PCD) between
valve and the gearbox are correct and as per the requirement
4.
The mounting flange of valve and gearbox should be de-greased
5.
Mount the gearbox on valve or spigot carefully making sure the valve stem /
coupling enters the sector gear bore. Never use the hand wheel or spur gear
attachment to lift the gearbox while mounting onto the valve
6.
Fasten the mounting bolts with the help of spring washers. Use 8.8 grade fasteners
or above
7.
In case of re-installation after a long storage period, check the status of oil seals,
‘O’ rings and also whether the gearbox body / cover are cracked or broken.
