OPERATION AND MAINTENANCE MANUAL
09-2015
8
4 ASSEMBLY AND INSTALLATION
4.1 ASSEMBLY GUIDELINES
The Type 6516 check ball valves can be installed in underground or overground pipelines both in
horizontal or vertical orientation as shown in the following figure. The flanged valves are suitable for joining
with the flanged ends of pipelines with the size equal to that of the valve flanges. 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, remove the main bore plugs, check the inner surfaces of the
valve and thoroughly flush with water, if necessary.
The assembly method is shown in the following figure:
1. Valve; 2. Nut; 3. Gasket; 4. Pipeline flange; 5. Washer; 6. Fastening bolt
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 flanged check ball valves shall be operated according to the requirements for check valves, i.e. in the
orientation shown in the permitted orientation diagram. The check ball 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 ball
inside the body and damage to the rubber ball coat. If the ball is stuck, start the installation pump for a few
