Marwin Valve 8700 Series Installation and operating instructions

3170 Wasson Road • Cincinnati, OH 45209 USA
Phone [phone] • Fax [phone]
[email protected] • www.marwinvalve.com
I & M 8700 Series
Installation & Maintenance Instructions for
Marwin 8700 Series Three Piece Ball Valves
Warning: Marwin Valve ball valves must only be used, installed and repaired in accordance with these Installation & Maintenance Instructions.
Observe all applicable public and company codes and regulations. In the event of leakage or other malfunction, call a qualified service person;
continued operation may cause system failure or a general hazard.
Please read these instructions carefully!
Your Marwin Valve product will provide you with long,
trouble-free service if it is correctly installed and main-
tained. Spending a few minutes now reading these
instructions can save hours of trouble and downtime
later. When making repairs, use only genuine Marwin
Valve parts, available for immediate shipment from the
factory.
Scope
This manual is intended as a guide to assist custom-
ers in the storage, installation, and maintenance of
Marwin 8700 Series ball valves. Subsequent additions
or special instructions will be provided for special
valves, critical service or customer requirements.
Applicability
This manual is applicable to the 8700 Series Marwin three
piece ball valves.
Caution
To help prevent injury to personnel or damage to
equipment, please read this section completely before
performing any operations.
Valve pressure ratings are based on many vari-1.
ables, including valve series and size, as well as
body, seat and bolt material. Verify that application
does not exceed the pressure or temperature rating
on the nameplate.
Always2. depressurize the line with the valve in the
open position before disassembly. Cycle valve in
depressurized line before removing valve.
Wear protective equipment and take appropriate3.
precautions to safeguard against injury caused by
the discharge of trapped fluids.
Use only Marwin recommended spare parts for4.
maintenance.
To ensure safety and maintain warranty, never5.
modify valve in any way without prior approval from
Marwin.
Storage
A petroleum-based oil (silicone free) is used as lubrica-
tion on all internal surfaces. This may be removed with
a solvent if found objectionable. All valves are adequate-
ly packed in a strong cardboard case in such a way
as to avoid any possible damage during transport and
storage.
Caution: if ball valves are not destined for immediate
use, the following precautions should be taken:
If possible, leave the ball valves in their packing1.
cases during the period of storage.
Ball valves must remain in open position during this time.2.
In order to prevent damage, protective plastic3.
covers on valve ends should not be removed until
immediately prior to installation.
It is advisable to store the valves in waterproof con-4.
ditions. Ball valves should be protected to safeguard
against humidity, moisture, dust, dirt sand, mud, salt
spray and seawater.
All valves complete with actuators are to be stored5.
in dry conditions.
Valves to be stored for a long period of time should6.
be checked by the quality control personnel every
six months; every three months when valves are
automated.

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 and1.
after installation.
Pipe must be flushed to clean dirt, welding2.
residues, etc. which would damage ball or
seats.
The valve should be kept in OPEN POSITION3.
during installation and protective plastic
covers must be removed only at the moment of
installation.
Before shipment, the ball is lubricated with a4.
pure Vaseline oil. This can be easily removed
with an application compatible solvent if
required.
If the valve was specified to be tested per ASTM5.
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 when6.
installing automated ball valves that the ball is in
the proper position.
 Installation of Threaded-Ends
Unless otherwise specified, pipe threads are1.
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 not3.
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.
 Installation of Welded-End Ball Valves
Tack weld in four points on both end caps.1.
Lift out the valve body and seat per disassembly2.
section in this procedure and complete the welding.
Allow welds to cool.3.
Reassemble valve per section in this procedure and4.
inspect for easy operation.
 Installation of Flanged-Ends
Verify valve is in the full open position.1.
Use the appropriate size bolt and heavy hex nut2.
(not included) as recommended for flange size and
class.
Flange connection requires gasket (not included).3.
Follow gasket manufacturer's recommended prac-4.
tice for tightening flange bolts.
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 with2.
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.
Ball valves do not normally need internal lubrica-1.
tion or routine maintenance during service.
Packing may be adjusted if the valve is leaking2.
around the stem, or the stem feels loose. See
Troubleshooting – A. Stem Leakage.
Internal maintenance consists of replacing pack-3.
ing, seats and seals, and ball or stem if worn or
damaged, and requires partial or full disassembly
by qualified personnel following the instructions in
this manual.
Valve Disassembly
Before starting maintenance, read the information in the
Caution Section of this manual.
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.
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Remove bolts (15) securing end cap and separate3.
end caps (2) from body (1).
Close the valve and remove ball (4), seats (3)and4.
body seals (6). Be careful not to damage the ball.
Remove the upper handle nut (12), and handle5.
(11).
Remove spacer ring (9B), saddle lock washer (19),6.
lower handle nut (12), Belleville spring washers
(10), gland ring (9A), and packing (8).
Push the stem (5) into the body (1). Remove O-7.
Ring (16) and thrust washer (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 de-1.
fect. 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.
Seals - Stem seals and body seals, including thrust3.
washer, should be discarded and replaced.
Remaining components of the valve. After clean-4.
ing, carefully examine for wear, corrosion and
mechanical damage. Replace all defective parts.
Clean inside of body and stem housing. Light5.
grease, compatible with line fluid, can be used on
ball, seals and stem surface.
Note: Recommended spare parts are indicated by
an asterisk on the part name in the exploded view at
the end of this manual. Please specify specic valve
number to ensure proper parts are ordered. Marwin
Valve does not take responsibility for incorrectly
ordered spare parts.
Re-Assembly
A. Stem
Replace thrust washer (7) and O-ring (16) on stem,1.
then insert the stem from inside of body.
Install stem packing (8), gland ring (9), Belleville2.
spring washers (10), lower handle nut (14), and
tighten until snug, then one-half turn (See Bolt
Torque Table). To avoid rotation of stem, insert the
handle and ball. Install saddle lock washer (17)
and spacer ring (9B).
a) Istall the handle (11) and upper handle nut (12),
then tighten.
B. Ball, Seats and Seals
Place the stem (5) in closed position and insert the1.
ball (4), aligning groove in ball with bottom of stem.
Position the ball in the open position then insert a2.
seat (3), body seal (6), and end cap (13) on each
side of body (10).
Install and hand tighten body bolts (15), lock3.
Testing
After completing the reassembly, check that valve1.
operates smoothly by opening and closing valve
several times.
If entire valve was removed from line and if facili-2.
ties area available, test the ball valve to appropri-
ate specifications.
Troubleshooting
A. Stem Leakage
Leakage in the stem packing area may be elimi-1.
nated by adjusting the lower stem (gland) nut.
Remove handle parts (See Valve Disassembly, A5).
See Bolt Torque Table for stem nut socket size and
reference torque. Increase the torque on the lower
stem nut (12) in one-sixth turn increments. Insure
stem does not rotate while tightening stem nut. If
leakage persists, replace stem O-ring (16) and
packing (8).
B. Body Seal Leakage
Check the torque of the body bolts (15) according1.
to Torque Table. Replace body seals (6) if leakage
persists.
C. In Line or Seats Leakage
Check to be sure valve is in fully closed position. If1.
leakage persists, the valve must be disassembled
and damaged parts replaced.
washer (16), and nut (17).
Tighten nuts (17) to recommended torque values4.
(see Bolt Torque Data) using an alternating/oppos-
ing pattern with no more than 1/4 turn on each bolt
before alternating.
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3170 Wasson Road • Cincinnati, OH 45209 USA
Phone [phone] • Fax [phone]
[email protected] • www.marwinvalve.com
Bulletin IM-8700-0709
Exploded View
Item # Quantity Part Name Item # Quantity Part Name
1 1 Body 12 2 Handle Nut
2 2 End Cap 13 1 Stop Screw & Nut
3 2 *Seat 14 1 Handle Cover
4 1 Ball 15 4 Bolt, Body
5 1 Stem 16 4 Lock Washer, Body
6 2 *Seal, Body 17 4 Nut, Body
7 1 *Thrust Washer 18 1 *O-Ring, Stem
8 1 *Packing 19 1 Locking Tab
9A 1 Gland Ring 20 2 Anti-Static Ball (In Stem)
9B 1 Spacer Ring, Stem 21 2 Anti-Static Spring (In Stem)
10 2 Belleville Spring Washer 21 1 Name Plate (Not Shown)
11 2 Locking Handle
Body Bolt Torque Valve Table
Valve Size Bolt Size Torque, in-lbs (n.M) Tolerance
1/2" M8 165 (19)
+/- 10%
3/4" M8 195 (22)
1" M8 220 (25)
1-1/2", 2" M10 360 (41)
Valve Size Nut Flats Torque, in-lbs (n.M) Tolerance
1/2", 3/4" 17mm 31 (3,5)
+/- 10%1" 22mm (7/8") 35 (4)
1-1/2", 2", 1-1/6 in (27mm) 48 (5,5)
Body Bolt
Stem Nut
14
17
10
9A
8
15
3
1
5
4
7
2
19
16
13
12
12 9B 11
* Recommended spare parts
18
6