Jafar 2312 Operating Manual - Page 6

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Jafar 2312 Operating Manual
4. STORAGE & TRANSPORT
The products are packed on EURO pallets (1200x800 mm) or in custom containers, as applicable. Store the valves
in clean indoor rooms without bacteriological or chemical contaminants and at a room temperature between -20°C
and 70°C. Protect the paint coat and rubber parts from prolonged exposure to UV radiation. The filters should be
protected against mechanical damage.
Protect the rubber parts from compression by keeping the gate valve wedge closure halfway open. Secure the
products against shifting during shipping and handling. The gate valves shall be handled on slings and secured
from rotating.

5. INSTALLATION

The flanged gate valves with soft seals intended for gas flow isolation in NG pieline systems and other fluid
systems, can be installed in underground pipelines or overground pipeline installations, both horizontal and
vertical, with any direction of flow of the medium. The Type 2312 gas gate valves are intended for installation
between resistance-welded pipeline ends. The Type 2314 gas gate valves are intended for installation between
fusion-welded pipeline ends. Note that the completed installation must not expose the valve to bending or tensile
stress from loading with the unsupported pipeline sections, and the valves must be installed aligned with the piping.
Consider proper compensation of the pipeline dimensional changes from temperature and pressure in the
installation. The gate valve is ready for installation as assembled and adjusted by the manufacturer. Any
dismantling of the gate valve components may result in loss of seal.
Before attempting to install the valve, check the technical and commercial documents delivered with the product
to verify that your media and pipeline operating parameters comply with the manufacturer's declaration. Any
change in the operating conditions must be consulted with the manufacturer beforehand.
Before attempting to assemble the valve, remove the main bore plugs, check the inner surfaces of the valve and
thoroughly flush with water, if necessary. Install the gate valve on a base or a support adequate to the size and
weight of the valve, to prevent strain of the piping with the valve. Use suitable piping flanges, gaskets and bolts
for the valve flange ends. The valve and piping flange holes must be aligned. Tighten the connection flange bolts
crosswise to ensure a proper seal pressure. The gate valve location must prevent exposure to freezing of the
medium flowing through the gate valve. Equip the gate valve with a suitable control, e.g. a spindle handwheel with
a flexible or rigid housing, an electric drive unit and a pedestal. When installing a housing, it is necessary to equip
the unit with a street box founded on a base slab. When using a spindle extension, make sure that the weight of the
extension is not transferred to the gate valve spindle. To prevent the load transfer, use holding pieces, mounted to
the chamber/vault walls. Spindle extensions over 3000 mm long shall be attached via Cardan joints. Having
completed the installation, perform a pressure test at a maximum test pressure equal to 1.5 times the nominal
pressure.
Caution! If the product has mechanical damage, do not install it in the pipeline.

6. OPERATION AND MAINTENANCE

The gate valve shall be operated in accordance with all relevant requirements for stop valves, i.e. kept either in the
fully open or fully closed position. Leaving the gate valve partially opened (or closed) may result in seal failure.
The gate valve can be controlled with:
a handwheel sized according to the Product Specification Sheet and mounted on the gate valve spindle or a
pedestal;
a T-socket wrench, if the spindle neck is in a housing;
an electric or pneumatic drive unit;
other driving gear, e.g. a handwheel with a chain.
Valve control requires a specific driving torque (see table in Section 2) and a specific number of spindle turns. Do
not exceed the maximum driving torque.
To ensure full operational efficiency, carry out a technical inspection and maintenance at least once a year as
follows:
Operate the gate valve from the fully open position to the fully closed position, or vice versa, as the case may
be.
Follow the driving torque limits specified in the table in Section 2.
OPERATING MANUAL
11-2020
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