Vacuum Breaker Valves

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CLA-VAL

TM

Vacuum Breaker / Air
VACUUM PREVENTION AND SLOW AIR RELEASE FOR PRESSURE SURGE CONTROL
Cla-Val Vacuum Breakers are reliable and economical pipeline surge control components, requiring no regular maintenance. The Vacuum Breaker Valve (Large orifice combined with Air Release Valve (small orifice) are normally closed. But when installed at points where water column separation can occur, both orifices open admitting air into pipeline, then instantly close to trap air and thereby cushioning rejoining of the water column. In this manner severe pressure surge/water hammer is prevented as the system returns to normal operation. Simultaneously the small orifice Air Release Valve opened...due to vacuum and stays open...venting the discharge of trapped air from pipeline slowly until gradual normal pipeline pressure is achieved. Various small orifice are available. See small orifice chart, Page 45. Water column separation in a pipeline may create high levels of vacuum only momentarily, but the severe damage,such as a pipeline rupture can occur when the water column rejoins. Also momentarily vacuum conditions can easily cause a thin wall pipeline or sealed water tank to collapse due to vacuum when draining fluid. Metal to Buna-N® insures “drop tight” seal at any pressure. For these reasons it is sound engineering practice to use Cla-Val Vacuum Breaker Air Release Valves to prevent water column separation in pipelines and collapse of tanks.

HOODED SCREENED INLET STANDARD

“Drop Tight” Metal to Buna-N® Seating
SEATED
S E A T BODY

UNSEATED
S E A T BODY

FLANGED STYLE 125 LB & 250 LB. CLASS 4" THRU 24" SIZE

DISC CLOSED

DISC OPEN

INSERT

TYPICAL APPLICATIONS

AIR INFLOW CAPACITY CHARTS IN CUBIC FEET OF FREE AIR/SEC.
LARGE ORIFICE AIR INLET/VACUUM BREAKER VALVES
40 30 26 22 16 14 10 8 6 4 2 0 0 1 2 3

AIR RELEASE VALVE VACUUM BREAKER VALVE

VACUUM ACROSS VALVES IN PSI

3"

2"

1"

1/2"

4 5

THREADED INLET STYLE
FLOW SEPARATION
(VACUUM BREAKER)

750

700

650

600

550

500

450

400

350

300

250

200

150

125

100

75

50

25 0 1 2 3

FLOW REJOINS
(AIR RELEASE)

PIPELINES SURGE CONTROL

16"

14"

12"

10"

8"

6"

4"

4 5

VACUUM ACROSS VALVES IN PSI

VACUUM BREAKER VALVE

FLANGED INLET STYLE

SMALL ORIFICE AIR RELEASE VALVES
VACUUM CONDITION TANK PROTECTION AGAINST COLLAPSE

500

1/8"
300 150 100 50 25 5 5 10 20 30 40 50 75 100 125 150 200 250

3/32"

3/16"

7/32"

Discharge of Air Through an Orifice in S.C.F.M (Standard Cubic Feet of Free Air Per Minute)
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CLA-VAL

TM

Vacuum Breaker Air Release Valves in 3 styles:
AIR OUT

A

A

AIR RELEASE

D

SMALL ORIFICE

AIR IN

Air Out

B
A
I

A
I
R
CLOSED

C B
I

OPEN

C

I

N
X

N

STYLE 1.
Flanged
VACUUM BREAKER/AIR RELEASE

VACUUM BREAKER LARGE ORIFICE

STYLE 2.
Threaded

VACUUM BREAKER (ONLY) SIZE 1/2" 1" 2" 3" MODEL NO. 38.5 VB 381 VB 382 VB 383 VB

ANSI CLASS 125
VACUUM BREAKER WITH AIR RELEASE VACUUM BREAKER ONLY

SIZE

MODEL NO.

3 4 6 8 10 12 14 16

383VB/AR 384VB/AR 386VB/AR 388VB/AR 3810VB/AR 3812VB/AR 3814VB/AR 3816VB/AR

A 16 171/2 201/4 23 26 29 311/4 33 3/4

B
15 15 1/2 16 1/4 18 1/4 19 3/4 19 1/4 20 21

MODEL NO.

C

D

X
1 13/4 21/4 31/4 41/4
5/8

383VB 384VB 386VB 388VB 3810VB 3812VB 3814VB 3816VB

8 10 111/4 9 141/4 11 18 131/2 211/2 16 213/8 19 223/4 21 261/2 231/2

SIZE NPT 1/2" 1" 2" 3"

MODEL NO. 38.5 VBT/AR 381 VBT/AR 382 VBT/AR 383 VBT/AR

A
6 7 1/2" 10" 10"
1/8"

B
14" 15 1/2" 18" 18"

A
6 7 1/2" 10" 10"
1/8"

B
7" 9 1/2" 12" 12"

C
9" 12" 14" 15"

15/16 21/8

Flange Style (No Hood) Mating Flange required to retain seat supplied by customer

STYLE 3.
Air Out

ANSI CLASS 250
VACUUM BREAKER WITH AIR RELEASE VACUUM BREAKER ONLY

A

A
I
R

SIZE

MODEL NO.

3 4 6 8 10 12 14 16

383VB/AR.3 384VB/AR.3 386VB/AR.3 388VB/AR.3 3810VB/AR.3 3812VB/AR.3 3814VB/AR.3 3816VB/AR.3

A 16 18 21 24 263/4 30 321/4 34 3/4

B
15 151/2 161/4 181/4 193/4 191/4 20 21

MODEL NO.

C
10 111/4 141/4 18 211/2 213/8 223/4 261/2

D
8 10 121/2 15 171/2 201/2 23 251/2

X
1 13/4 21/4 31/4 41/4
5/8

I

383VB.3 384VB.3 386VB.3 388VB.3 3810VB.3 3812VB.3 3814VB.3 3816VB.3

R

E B
I
I

N
X

N

15/16 2 1/8
VACUUM BREAKER WITH AIR RELEASE

ANSI CLASS 125
VACUUM BREAKER ONLY

SIZE

MODEL NO.

Note: Cla-Val Vacuum Breaker Valves are recommended for waste-water application. Be sure to specify

3 4 6 8 10 12 14 16

383VBG/FFAR116 384VB/FFAR116 386VB/FFAR116 388VB/FFAR116 3810VB/FFAR116 3812VB/FFAR116 3814VB/FFAR116 3816VB/FFAR116

A 16 171/2 201/4 23 26 29 311/4 33 3/4

B
15 15 1/2 16 1/4 18 1/4 19 3/4 19 1/4 20 21

MODEL NO.

E
6 71/4 93/4 121/2 151/2 141/4 153/4 175/8

D
8 9 11 131/2 16 19 21 231/2

X
1 13/4 21/4 31/4 41/4
5/8

383VBGFF 384VBFF 386VBFF 388VBFF 3810VBFF 3812VBFF 3814VBFF 3816VBFF

15/16 21/8

1325 Newport ¥ Website copyright in USA Specifications subject to change without notice. CLA-VAL P.O. Box Cla-Val¥2003 PrintedBeach, CA 92659-0325 ¥ Phone: 949-722-4800 ¥ Fax: 949-548-5441 ¥ E-mail: [email protected] E-38VB/ARcla-val.com (R-5/00)
'

PARTS LIST

Series 38VB/AR Release Valve Data and Sizing
Vacuum Breaker Valve Sizing
Vacuum Breaker Valve Air Intake capacity is the same as for air vacuum valves. Use data below for sizing or use Cla-Val Air Vacuum Valve selector slide rule. 1. 2. 3. 4. Series 38 Vacuum Breaker/Air Release valves should be sized to admit the maximum volume of air into the pipeline but not exceed 5 psi pressure differential across the valve inlet orifice. Each high point of change in grade must be examined independently when determining vacuum valve size. Use the steepest slope for calculation. Use the flow capacity charts located below to assist in vacuum valve sizing. Determine the smallest valve size capable of admitting air equal to the potential flow in CFS while not exceeding a pressure differential of 5 psi across the valve orifice (Based on gravity flow). The following formula should be used to calculate the rate of flow in CFS that can occur within the pipeline under gravity flow conditions.

Q = .0007872 C S5 D

Where: Q= Flow of water in cubic feet per second C= Coefficient in Chezy’s formula=110 S= Slope in feet per foot of length D= Inside pipe diameter in inches

5.

If thin wall steel pipe is being used, the risk of pipeline collapse due to the formation of vacuum must be considered. The following formula may be used to calculate the collapsing pressure of thin walled cylindrical steel pipe using a safety factor of four:

P = 16,250,000
6. 7.

T D

3

Where: P= Collapsing pressure in psi T= Thickness of pipe in inches D= Diameter of pipe in inches

For other pipe materials or thickness consult pipe manufacturer for pipe collapsing pressure. Determine the smallest valve size capable of admitting the required air in CFS (as found in step 5) without exceeding the collapsing pressure (as found in step 6) or 5 psi, whichever is less. Do not exceed a pressure differential greater than 5 psi.

Vacuum Breaker/Air Release Valve Specifications
Vacuum Breaker valves shall be flanged sizes 4” thru 42” or threaded 1/2” thru 3” and automatically open to admit large volumes of air into a system to break a vacuum. Optionally: an air release valve may be connected to the vacuum breaker valve to release air under pressure. Sizes 4” thru 10” must accept a wafer butterfly valve directly connected, without disc interference. The valve shall have a spring-loaded plug, center guided and in-flow area equal to valve size. The valve must have a screened protective hood and be installed vertically. The valve must crack open at 0.25 psi and full open at 2 psi pressure differential. All internals shall be field replaceable. The valve seating shall be metal with Buna-N seal for zero leakage at high and low pressure without seal damage. Materials of Construction: Valve Body and Cover . . . . . . . . .Cast Iron ASTM A126B Option: Ductile Iron ASTM A563 65-45-12 Valve Seat/Plug . . . . . . . . . . . . . .Bronze ASTM B584 Alloy C 83600 Optional: Stainless Steel ASTM A351 CF8M Spring . . . . . . . . . . . . . . . . . . . Stainless Steel ASTM A313 T302 Option When Specified: Supply automatic Air Release Valve with the Vacuum Breaker Valve, for release of air when the system is operating. Description/Materials: Valve body inlet shall be threaded with hexagonal shape for wrench use. The shut-off orifice button shall be Buna-N or Viton. Valve Body and Cover, Cast Iron; Float (unconditionally guaranteed); trim stainless steel type 304; all field replaceable. Non-Metallic linkage not acceptable. Valve exterior shall be coated with high quality, alkyd metal primer. Air release valves shall comply with AWWA C512-92 standards and tested at 1.5 times the working pressure. Test certificates; drawings; parts list; O&M materials shall be provided as requested. Vacuum breaker valves shall be Series 38VB/AR for water or wastewater as supplied by Cla-Val, Newport Beach. California.

1325 Newport copyright in USA Specifications subject to change without notice. CLA-VAL P.O. Box Cla-Val¥2003 PrintedBeach, CA 92659-0325 ¥ Phone: 949-722-4800 ¥ Fax: 949-548-5441 ¥ E-mail: [email protected]l.com ¥ Website cla-val.com
'

PL-37WS (1/2-3"Baffle Screen) (R-5/00)

PARTS LIST
¤

Series 38VB/AR
Vacuum Breaker / Air Release Valve Flanged Style
23 24 25 11 12 10 8 6 2 3 4 1 5
21 4 2 6 3
OUTLET

CLA-VAL

TM

D

A

17

A
I

A
I
R

13

34 5 1

7

12
10
11
STANDARD WORKING PRESSURE 175 PSI TEST PRESSURE 300 PSI

R

1" Piping Shut-Off

B

C

I

I

N

N

STYLE 1. Flanged

Series 34 Air Release Valve
Detail No. 1 2 3 4 5 6 8 10 11 12 23 24 25 Part Name Body Seat Plug Spring Bushing Seat Gasket Ring Plate Ring Bolts Screen Hood Steel Steel Material Cast Iron ASTM A126 Bronze ASTM B584 Bronze ASTM B584 Stainless Steel Type 302 Bronze ASTM B584 Stainless Steel Type 304 Lexide Steel Steel Stainless Steel Steel 1020 Cadmium Plated Cadmium Plated Detail No. 1 2 3 4 5 6 7 10 11 12 13 17 21 34 Part Name Body Cover Lever Frame Seat Float Gasket Cover Bolt Float Arm Orifice Button Pivot Pin Pin Retainer Float Retainer Locator Lock Washer Material Cast Iron ASTM A126 Class B Cast Iron ASTM A126 Class B Stainless Steel T304 ASTM A240 Stainless Steel T303 ASTM A276 Stainless Steel T304 ASTM A240 Garlock #3000 (Non-Asbestos) Alloy Steel SAE Grade 5 Stainless Steel T304 ASTM A240 Viton Stainless Steel T303 ASTM A276 Stainless Steel PH 15-7 Mo Stainless Steel T304 ASTM A276 Stainless Steel T-18-8 ASTM A276 Stainless Steel T304 ASTM A204

Larger Sizes Available

ANSI CLASS 125
VACUUM BREAKER WITH AIR RELEASE VACUUM BREAKER ONLY

ANSI CLASS 250

SIZE

MODEL NO.

3 4 6 8 10 12 14 16

383VB/AR 384VB/AR 386VB/AR 388VB/AR 3810VB/AR 3812VB/AR 3814VB/AR 3816VB/AR
'

A 16 171/2 201/4 23 26 29 311/4 33 3/4

B
15 15 1/2 16 1/4 18 1/4 19 3/4 19 1/4 20 21

MODEL NO.

C

D

X
1 13/4 21/4 31/4 41/4
5/8

WT. LBS
45 62 160 170 270 375 460 600

VACUUM BREAKER WITH AIR RELEASE

VACUUM BREAKER ONLY

SIZE

MODEL NO.

383VB 384VB 386VB 388VB 3810VB 3812VB 3814VB 3816VB

10 71/2 111/4 9 141/4 11 18 131/2 211/2 16 213/8 19 223/4 21 261/2 231/2

15/16 21/8

3 4 6 8 10 12 14 16

384VB/AR.3 384VB/AR.3 386VB/AR.3 388VB/AR.3 3810VB/AR.3 3812VB/AR.3 3814VB/AR.3 3816VB/AR.3

A 17 18 21 24 263/4 30 321/4 34 3/4

B
16 151/2 161/4 181/4 193/4 191/4 20 21

MODEL NO.

C
10 111/4 141/4 18 211/2 213/8 223/4 261/2

D
81/4 10 121/2 15 171/2 201/2 23 251/2

WT. LBS X
1 13/4 21/4 31/4 41/4
5/8

384VB.3 384VB.3 386VB.3 388VB.3 3810VB.3 3812VB.3 3814VB.3 3816VB.3

15/16 2 1/8

45 62 160 170 270 375 460 600

1325 Newport copyright in USA Specifications subject to change without notice. CLA-VAL P.O. Box Cla-Val¥2003 PrintedBeach, CA 92659-0325 ¥ Phone: 949-722-4800 ¥ Fax: 949-548-5441 ¥ E-mail: [email protected] ¥ Website cla-val.com PL-38VB/AR Flanged (R-7/03)

PARTS LIST
¤

Series 38VBT/AR
Vacuum Breaker / Air Release Valve Threaded Style
A
AIR RELEASE
SMALL ORIFICE 21 4 2 6 3 13 12 10 11
AIR IN
AIR OUT

CLA-VAL

TM

17

Series 34 Air Release Valve
34 5 1
STANDARD WORKING PRESSURE 175 PSI TEST PRESSURE 300 PSI

7

23 2 8 4 7 6 3 5 20

B

Detail No. 1 2 3 4 5 6 7 10 11 12 13 17 21 34

Part Name Body Cover Lever Frame Seat Float Gasket Cover Bolt Float Arm Orifice Button Pivot Pin Pin Retainer Float Retainer Locator Lock Washer

Material Cast Iron ASTM A126 Class B Cast Iron ASTM A126 Class B Stainless Steel T304 ASTM A240 Stainless Steel T303 ASTM A276 Stainless Steel T304 ASTM A240 Garlock #3000 (Non-Asbestos) Alloy Steel SAE Grade 5 Stainless Steel T304 ASTM A240 Viton Stainless Steel T303 ASTM A276 Stainless Steel PH 15-7 Mo Stainless Steel T304 ASTM A276 Stainless Steel T-18-8 ASTM A276 Stainless Steel T304 ASTM A204

OPEN

9 1

VACUUM BREAKER/AIR RELEASE SIZE NPT 1/2" 1" 2" 3" MODEL NO. 38.5 VBT/AR 381 VBT/AR 382 VBT/AR 383 VBT/AR

VACUUM BREAKER (ONLY) SIZE 1/2" 1" 2" 3" MODEL NO. 38.5 VB 381 VB 382 VB 383 VB

A
6 1/8" 7 1/2" 10" 10"

B
14" 15 1/2" 18" 18"

WT.
23 34 60 66

A
6 1/8" 7 1/2" 10" 10"

B
7" 9 1/2" 12" 12"

C
9" 12" 14" 15"

WT.
16 28 54 60

Detail No. Part Name 1 Body 2 Cover 3 Baffle 4 Seat 5 Float 6 Gasket
'

Detail No. Material Cast Iron ASTM A126, Class B 7 Cast Iron ASTM A126, Class B 8 Ductile Iron ASTM A536-51T 9 Buna-N® 14 Stainless Steel ASTM A-240, T304 20 Garlock #3000 (Non-Asbestos) 23

Part Name Cover Bolt Retaining Screw Guide Bushing Pipe Plug Guide Shaft Hood

Material Alloy Steel ASTM A449, Grade 5 Stainless Steel ASTM A449, Stainless Steel ASTM A276 T303 Malleable Iron Stainless Steel ASTM A276 T303 Steel 1020

1325 Newport Website copyright in USA Specifications subject to change without notice. CLA-VAL P.O. Box Cla-Val¥2003 PrintedBeach, CA 92659-0325 ¥ Phone: 949-722-4800 ¥ Fax: 949-548-5441 ¥ E-mail: [email protected] ¥Threaded cla-val.com PL-38VB/AR (R-5/00)

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