OPERATION AND MAINTENANCE MANUAL 05/2015
7
pipelines with the size equal to the installation length. Note that the system must not expose the valve to bending
or tensile stress from loading with the unsupported pipeline sections. The valve assembled and delivered by the
manufacturer is ready for installation. Disassembly of the valve components without proper care may result in
loss of integrity.
4.2 ASSEMBLY INSTRUCTIONS
Before attempting to install the valve, check the technical and commercial documents delivered with the
product to verify that the media and pipeline operating parameters comply with the manufacturer's declaration.
Any change in the operating conditions must be consulted with the valve manufacturer beforehand.
Before attempting to assemble the valve, check the inner surfaces of the valve and thoroughly flush with
water, if necessary.
Install the flange-to-flange check flap valve between the adjacent flanges of the pipeline ends and bolt
down by alternately tightening the opposite pin bolts. The assembly method is shown in the following figure:
CAUTION!
Install the valve downstream of a straight pipeline the length of which is at least 5 times the pipeline
nominal diameter.
4.3 OPERATION
The flange-to-flange check flap valves shall be operated according to the requirements for check valves. The
check flap valve has a self-cleaning action. However, it is recommended to periodically purge the valve with
fresh water (once a year) to assure full performance. Hard solids with the size above 5 mm should be filtered out
of the transmitted medium to prevent seizure of the flap inside the body and damage to the closure seal rubber
surface. If the flap is stuck, start the installation pump for a few seconds. If the problem persists, stop all
installation pumps, isolate the medium flow, and free the flap.
4.4 OCCUPATIONAL HEALTH AND SAFETY
The valves are eligible for the OHS guidelines and recommendation concerning installation of pipelines
and devices for water supply stations, heat power plants, water treatment plants, sewage treatment plants,
pumping stations and other facilities, and eligible for the Polish Regulation concerning general OHS laws (use of
personal protective equipment for hands, legs and head, and safety garment), especially at work with low or high
temperature hazard.
Misuse of this product is prohibited.
5 WARRANTY TERMS AND CONDITIONS
