Crane Duo-Chek User manual

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Duo-Chek®Check Valves
Installation and Operation Manual
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Duo-Chek® Check Valves
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Please read the warning and caution
statements on pg 2 prior to installation.
2 www.cranecpe.com
Index
Installation and Maintenance Page 3
Assembly Page 4
Parts Page 5
WARNING
Proper installation plays an important role in valves performance. Installation must be performed
-
result in damage to the valve.
!
CAUTION
READ INSTRUCTIONS BEFORE INSTALLATION or valve service. Failure to follow instructions could
result in death or serious injury. If there is any question, contact the factory at 936-271-6500.
!
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3
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Please read the warning and caution
statements on pg 2 prior to installation.
Installation & Maintenance
INSTALLATION
1. Remove the valve from carton or packing skid.
2. The protective rust proof coating on the internal parts of steel or cast iron valves should be re-
moved by brushing out with any standard petroleum solvent (Varsol, Kerosene), and air dry. Insure
internal parts operate freely.
3. Stainless Steel or Bronze valves need only to be wiped clean and installed.
4. In horizontal ow installation, the hinge pin must be vertical.
5. Insert the valve between two companion anges of the same series as the valve and place gaskets
on ange faces. The arrow on the valve or name plate indicating direction of ow should coincide
with line ow. Install studs through companion anges and tighten, using standard industry prac-
tice.
6. In liquid service we recommend valve be installed at least ve (5) pipe diameters downstream
from a pump discharge and/or other pipe ttings for maximum service life. Consult factory.
MAINTENANCE
Make sure the valve is not under pressure before starting any maintenance.
Disassembly** (Refer to assembly drawing on next page.)
1. Lay valve down with the downstream side of the valve upward.
2. Remove stop pin retainers (6) and hinge pin retainers (7).
3. Remove stop pin (3), being careful with the short hooked spring legs on valves 6”and larger.
4. Remove hinge pin (4) out of the body (1) while holding spring(s) rmly as some are preloaded and
may snap out. Observe caution.
5. Remove springs (5), plates (2), and bearings (8), (9), and (10).
CAUTION
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4www.cranecpe.com Please read the warning and caution
statements on pg 2 prior to installation.
Assembly
ASSEMBLY**
1. Lay body down with downstream side of valve upward.
2. Clean all parts in a suitable solvent.
3. Position both plates (2) in body (1) with hinge lugs together and align with pin holes. If valve is equip-
ped with support sleeves (11), assemble into plate with body bearings (9).
4. Lay springs (5) in plate (2) recess, between lugs, with short hooked leg extending upward on valves
6” and larger (other longer leg to contact plate). On smaller valves, spring(s) (5) without short leg, wind
spring legs 180 , install with legs contacting each plate and hold to insert hinge pin (4) in step 6.
5. Insert all bearings provided, (8), (9) and (10).
6. Insert hinge pin (4) through plate lugs (2), bearings, (8), (9), (10), and through spring coils (5).
7. Pull stop pin leg of spring (short hooked leg) toward plate leg and insert stop pin (3). Repeat until
stop pin is fully inserted in body holes.
8. Install hinge pin retainers (7) and stop pin retainers (6) using PTFE tape or a suitable thread seal- ing
compound.
** No Special tools are required.
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5
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Please read the warning and caution
statements on pg 2 prior to installation.
Duo-Chek Parts
Item
Number No. Req'd Description
1 1 Body
2 2 Plate
3 1 Stop Pin
41Hinge Pin
5 2* Spring
6 2 Stop Pin Retainer
72Hinge Pin Retainer
84** Plate Lug Bearing
94** Body Lug Bearing
10 3* Spring Bearing
11+ 2Support Sleeve
10*
10
1
3
6
7
4
8
11
9
5*
5
2
* Some valves require 4 springs & 5 spring bearings
** These quantities may vary according to the valve size
+ Not required on valves smaller than 24"
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9860 Johnson Road
Montgomery, TX USA 77316
Tel: [phone]
Fax: [phone]
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DEPA®, DUO-CHEK®, ELRO®, FLOWSEAL®, JENKINS®, KROMBACH®, NOZ-CHEK®, PACIFIC VALVES®, RESISTOFLEX®, REVO®, SAUNDERS®, STOCK-
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