Marwin Valve 9000F Series Two Piece Аква техника - Manual (Page 2)

Maintenance During Storage Period
Internal surface should be inspected to check for •
dust or other foreign objects.
Rust or dust must be removed by cleaning with •
proper solvent.
After cleaning, ball valves must be lubricated with •
an adequate lubricant.
Ball valves should be operated for at least two •
complete cycles before installing or returning to
storage.
Installation
The ball valves may be installed in any position using
standard pipe fitting practices.
Caution: Before installation of the valve:
Pipe must be free of tension both during and 1.
after installation.
Pipe must be flushed to clean dirt, welding 2.
residues, etc. which would damage ball or
seats.
The valve should be kept in OPEN POSITION 3.
during installation and protective plastic
covers must be removed only at the moment of
installation.
Before shipment, the ball is lubricated with a 4.
pure Vaseline oil. This can be easily removed
with an application compatible solvent if
required.
If the valve was specified to be tested per ASTM 5.
16.34, there may be some trapped water be-
tween the ball and the body cavity. This can be
removed by partially opening the valve, thereby
exposing the cavity to the through port of the
ball.
Special care should always be taken when 6.
installing automated ball valves that the ball is in
the proper position.
 Installation of Threaded-Ends
Unless otherwise specified, pipe threads are 1.
American National Standard Taper Pipe Threads
(NPT) per ANSI B1.20.1, and require that a pipe
sealant be used.
Use an anti-seize thread sealant to seal and pre- 2.
vent galling.
a. Marwin recommends PTFE-based liquid sealant
or Grafoil tape as thread sealants.
b. Notes:
1.Use all pipe sealant products in accordance
with the manufacturer’s instructions and good
piping practices.
2. Correct lubrication of stainless steel pipe threads
in especially important to prevent galling.
To prevent distortion or damage to the valve, do not 3.
apply torque through the valve. When tightening
valve, use wrench on the end nearest the pipe being
tightened.
Always leak test the system before using. 4.
Manual Operation
Open and close the valve by turning the handle one- 1.
quarter turn (90°).
Valve is in open position when handle is in line with 2.
the pipe.
Valve is in closed position when the handle is per- 3.
pendicular to the pipe.
Maintenance
Before starting maintenance, please read information
contained in the Caution Section of the manual.
Open and close the ball valve at least once to 1.
release the pressure completely from valve body.
Ball valves, if correctly used, normally do not 2.
need any internal lubrication and maintenance.
However, when necessary, ball or seats can be
replaced by qualified personnel following the
instructions of this manual.
For further information, please refer to 3. SPARE
PARTS LIST .
Valve Disassembly
A. To inspect and/or Replace Body Seals, Seats,
Packing & Ball
Reference cross section for part identification
Valve must be in the open position. 1.
Remove valve from line. 2.
Unscrew end cap (10) to expose ball (11). 3.
Close the ball and remove ball (11), seat (9) and 4.
body seal (12). Be careful not to damage the ball.
Remove the handle nut (3), handle (2), and gland 5.
nut (6).
Push the stem (5) into the body (13). Remove thrust 6.
washer (8) and packing (7) from stem.
B. Inspection and Replacement
With the valve completely disassembled, clean and
examine all components.
The surface of the ball should be free from any 1.
defect. If any are found, the ball should be replaced.
Using a defective ball will be extremely detrimental
to valve performance.
Seats. Replacement of seats is recommended. 2.
Stem seals and body seals. Should be discarded 3.
and replaced.
Remaining components of the valve. After cleaning, 4.
carefully examine for wear, corrosion and mechani-
cal damage. Replace all defective parts.