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MODEL
81-12
Check Valve
• Simple Proven Design
• No-Slam Operation
• Drip-Tight Shut-Off
• Recommended for Variable Speed Pumps
• No Packing Glands or Stuffing Boxes
• Easy to Install & Maintain
The Cla-Val Model 81-12 Check Valve is a hydraulically operated
No-Slam Check Valve. This valve opens when the pressure at the
inlet exceeds the discharge psudden opening surges. When a
pressure reversal occurs the higher downstream pressure is applied
to the cover chamber through the control tube lines, and the valve
closes drip tight.
This valve is ideally suited for use where a positive shutoff is required.
The rubber disc assures tight sealing even if the fluid contains grit or
other small-size particles. The simple packless design insures
reliable operation and freedom from leaks.
Schematic Diagram
Item Description
1 Hytrol (Main Valve)
Typical Applications
Install on the discharge of booster pumps to prevent
return flow when pump is off. Relief valve as shown is
good practice to minimize surges when pump stops.
For valve sizes larger than 4", use Model 81-02.
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CLA-VAL
Copyright Cla-Val 2013 Printed in USA Specifications subject to change without notice.
P.O. Box 1325 • Newport Beach, CA 92659-0325 • Phone: 949-722-4800 • Fax: 949-548-5441 • E-mail: claval@cla-val.com • Website cla-val.com
©
81-12
Valve
Selection
Basic Valve
100-01
Suggested
Flow
(gpm)
100-01 Pattern: Globe (G), Angle (A), End Connections: Threaded (T),
Grooved (GR), Flanged (F) Indicate Available Sizes
Inches 1 1¼ 1½ 2 2½ 3 4
mm 25 32 40 50 65 80 100
Pattern G, A G, A G, A G, A G, A G, A G, A
End
Detail
T T
T, F,GRT, F,GRT, F,
GR*
T, F,
GR
T, F,
GR
Maximum 55 93 125 210 300 460 240
Pilot System Specifications
Temperature Rating
Water:
Speed Controls
For valves with opening and closing
speed controls order Model 81-02
Materials
Standard Pilot System Materials
Fittings: Brass
Tubing
: Copper
Suggested
Flow
Maximum 3.5 6 8 13 19 29 15.1
(Liters/Sec)
100-01 Series is the full internal port Hytrol. *Globe Grooved Only
Optional Pilot System Materials
Pilot Systems are available
with optional stainless steel
or Monel materials.
Model 81-01 Dimensions (In Inches)
Valve Size (Inches) 11¼1½22½3 4
A Threaded
AA 150 ANSI
AAA 300 ANSI
AAAA Grooved End
B Dia.
C Max.
CC Max. Grooved End
D Threaded
DD 150 ANSI
DDD 300 ANSI
DDDD Grooved End
E
EE Grooved End
F 150 ANSI
FF 300 ANSI
G Threaded
GG 150 ANSI
GGG 300 ANSI
GGGG Grooved End
H NPT Body Tapping
J NPT Cover Center Plug
K NPT Cover Tapping
Stem Travel
Approx. Ship Wt. Lbs.
X Pilot System 11.00 11.00 11.00 13.00 14.00 15.00 17.00
Y Pilot System 9.00 9.00 9.00 9.00 10.00 11.00 12.00
Z Pilot System 9.00 9.00 9.00 9.00 10.00 11.00 12.00
7.25 7.25 7.25 9.38 11.00 12.50 —
— — 8.50 9.38 11.00 12.00 15.00
— — 9.00 10.00 11.62 13.25 15.62
— — 8.50 9.00 11.00 12.50 15.00
5.62 5.62 5.62 6.62 8.00 9.12 11.50
5.50 5.50 5.50 6.50 7.56 8.19 10.62
— — 4.75 5.75 6.88 7.25 9.31
3.25 3.25 3.25 4.75 5.50 6.00 —
— — 4.00 4.75 5.50 6.00 7.50
— — 4.25 5.00 5.88 6.38 7.88
— — — 4.75 — 6.00 7.50
1.12 1.12 1.12 1.50 2.69 2.06 3.19
— — 2.00 2.50 2.88 3.12 4.25
— — 2.50 3.00 3.50 3.75 4.50
— — 3.06 3.25 3.75 4.13 5.00
1.88 1.88 1.88 3.25 4.00 4.50 —
— — 4.00 3.25 4.00 4.00 5.00
— — 4.25 3.50 4.31 4.38 5.31
— — — 3.25 — 4.25 5.00
0.375 0.375 0.375 0.375 0.50 0.50 0.75
0.25 0.25 0.25 0.50 0.50 0.50 0.75
0.375 0.375 0.375 0.375 0.50 0.50 0.75
0.40 0.40 0.40 0.60 0.70 0.80 1.10
15.00 15.00 15.00 35.00 50.00 70.00 140.00
to 180°F. Max.
100-01
Threaded &
Flanged
H
Inlet
G
GG
GGG
100-01
H
Inlet
A
AA
AAA
Grooved
B
Inlet
B
Inlet
When ordering
please specify:
1. Catalog No. 81-12
2. Valve Size
3. Pattern: Globe
4. Pressure Class
5. Threaded or
6. Desired Options
7. When Vertically
(Diameter)
J
K
D
DD
DDD
(Diameter)
DDDD
AAAA
or Angle
Flanged
Installed
J
K
(MAX)
C
E
CC
(MAX)
Outlet
Outlet
EE
GGGG
F
FF
Pressure Ratings
ASTM A536 Ductile Iron B16.42 250 400 400
ASTM A216-WCB Cast Steel B16.5 285 400 400
ASTM B62 Bronze B16.24 225 400 400
Note: * ANSI standards are for flange dimensions only.
(Recommended Maximum Pressure - psi)
Valve Body & Cover
Grade Material
ANSI
Standards*
Pressure Class
Flanged
150
Class
300
Class
Threaded
300
Class
Materials
Component Standard Material Combinations
Body & Cover Ductile Iron Cast Steel Bronze
Available Sizes 1" - 4" 1" - 4" 1" - 4"
Disc Retainer &
Diaphragm Washer
Trim: Disc Guide,
Seat & Cover Bearing
Cast Iron Cast Steel Bronze
Bronze is Standard
Stainless Steel is Optional
Disc Buna-N®Rubber
Diaphragm Nylon Reinforced Buna-N®Rubber
Stem, Nut & Spring Stainless Steel
Flanged valves are available faced but not drilled.
‡ End Details machined to ANSI B2.1 specifications.
Valves for higher pressure are available; consult factory for details
For material options not listed, consult factory.
Cla-Val manufactures valves in more than 50 different alloys.
E-81-12 (R-5/2013)
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