Hard Flanged Circuit Balancing Valves - Armstrong Pumps

® 

FILE NO.: 36.88 

DATE: November 20,1998 

SUPERSEDES: NEW 

DATE: NEW 

INSTALLATION AND OPERATING INSTRUCTIONS 

HARD FLANGED 

CIRCUIT BALANCING VALVES 

Model CBV- AF Angle Design 

Model CBV- SF Straight Design 

INDEX 

1.0 Installation of Valve Page 2 

2.0 Flange Bolt Tightening Page 2 

3.0 Conversion - Straight to Angle Page 2 

4.0 Operation Page 3 

5.0 Memory Setting (2-1/2" - 6) Page 3 

6.0 Repositioning Handwheel (2-1/2" - 6") Page 3 

7.0 Repacking of Valve (2-1/2" - 6") Page 4 

8.0 Flow Curves (Straight Design) Page 5 

9.0 Flow Curves (Angle Design) Page 6 

1

1.0 INSTALLATION 

1.1 To ensure accuracy of measurement, the CBV 

should be located at least five pipe diameters 

downstream from any fitting and at least ten pipe 

diameters downstream from a pump. Two pipe 

diameters downstream from the CBV should be 

free of any fitting (as illustrated in Fig 1). 

3.0 CONVERSION (Straight to Angle) 

3.1 Open the valve one complete turn. 

3.2 Remove the body bolts from the valve body. 

3.3 Rotate one-half of the valve body, 180, making 

sure the seat and "O" ring stay in position and do 

not get nicked or cut. 

3.4 Replace the body bolts and tighten evenly. 

Fig. 1 

1.2 CBV valves must be installed with flow in the 

direction of the arrow on the valve body. Easy 

access to the probe metering ports (P.M.P's) and 

handwheel must be provided. 

1.3 CBV valves can be installed in horizontal or 

vertical piping. The metering ports should never 

be installed below the pipe (pointing down), as 

this will allow system sediment to accumulate in 

the ports. (Illustrated below for horizontal piping in 

Fig. 2). 

Fig. 3 With no arrows visible, the Inner Scale set at 0 

on the indicator line aligned with the 0 on the 

Outer Scale; the valve is closed. 

Fig. 4 

Shows a valve setting of 2.0, indicating that the 

valve is partially open. 

Fig. 2 

(1) Metering Port (2) Body Port & (3) Handwheel 

Drain 

1.4 CBV angle-style valves are designed to replace 

piping elbows. 

1.5 Metering ports and body plugs may be 

interchanged for improved accessibility. 

2.0 BOLT TIGHTENING 

2.1 Tighten all bolts evenly in standard star pattern. 

When used with a "raised face" flange, there will 

be a gap between the faces on the outer flange 

diameters. 

2 

Fig. 5 With all arrows visible, the Inner Scale, set at 6 

and the indicator line aligned with Outer Scale 0; the 

valve setting is 6.0 and the valve is fully open.

4.0 OPERATION 

4.1 The valve operates from closed (Fig.3) to fully open 

by a counterclockwise rotation of the red handwheel. 

Using five (5) 380 turns far the 2-1/2" and 3" valves, six 

(6) turns for the 4", 5", and 6" valves, 12 turns for the 8" 

and 10" valves and 14 turns for the 12" valve. Two scales 

indicate the position of the valve. 

Inner Scale (Fig.4&5)- This sleeve has a vertical arrowed 

scale which indicated the number of full turns the valve 

have been opened 

Outer Scale (Fig 4&5)- This scale is a micrometer-type 

scale marked 0-9 at the tapered base of the handwheel. 

Each gives 1/10th indications for each 360 turn of 

opening against the indicator line of the Inner Scale. 

Connect meter quick-disconnect hoses to metering ports 

as follows: 

• Remove protective cap from metering ports 

• Insert and lock the meter probe into the metering 

ports 

4.2 The hose with the red fitting upstream: the hose with 

the blue fitting downstream. 

4.3 CAUTION: The probe should not be left inserted into 

the fitting for prolonged periods of time; overnight, etc, as 

leakage of the P.M.P, may occur when the probe is 

removed. 

The locking nut on the probe is designed to hold it in the 

P.M.P. when taking readings in systems having a high 

working pressure. As sealing is accomplished internally 

on the probe stem, it is only necessary to tighten the 

locking nut finger-tight. Overtightening may cause 

damage to the P.M.P. or locking nut threads. 

4.4 Safety glasses should be used. 

4.5 Before taking a flow measurement reading, set the 

valve to its fully open (4.0) or at a preset position 

Read the pressure drop across the valve with an 

Armstrong CBDM-135/60. Determine GPM now by 

use of valve C v , curve an Pages 5 and 6 or the 

Armstrong Circular Slide Rule. 

BODY 

"O" RING 

INDICATOR HANDWHEEL 

SLEEVE 

LOCK COLLAR 

RETAINING 

BOLT 

5.0 MEMORY SETTING (Fig. 6) 

2-1/2"- 6" Valves 

5.1 After the valve has been adjusted to its balance set 

point and without moving the handwheel, remove the 

retaining bolt from the end of the handwheel using a 1/4" 

Allen wrench. 

5.2 Carefully remove the handwheel and turn indicator 

sleeve assembly, leaving the valve at its balance set 

point. 

53 Turn the plastic memory stop (clockwise) down until it 

stops. Finger-tight pressure is sufficient. Do not overtighten. 

5.4 Holding the memory stops in position, turn the lock 

collar (clockwise) down until it stops against the valve 

bonnet. The memory has now been set. 

5.5 With the handwheel/turn indicator sleeve assembly 

still at its balance set point indication, reinstall them on 

the valve stem and hold in place with the 1/4" retaining 

bolt. 

CAUTION: Care must be taken not to rotate the valve 

stem or change the handwheel/indicator setting while 

setting the memory. 

6.0 REPOSITIONING HANDWHEEL 


6.1 The handwheel can be removed and repositioned in 

any of six positions around the stem. 

a) Close valve fully. 

b) Remove handwheel-retaining bolt. 

c) Remove handwheel and turn indicator sleeve 

by grasping the handwheel and pulling away 

from the valve body along the stem. 

d) Select a new position for easy reading and 

with the sleeve and handwheel held together 

in the closed position (0.0), push them back 

over the bonnet head and valve stem. 

e) Replace handwheel-retaining bolt. 

f) Open valve. 

6.2 If handwheel is removed for any reason, it is 

important to first close the valve and then replace 

the handwheel per 6.1 d) and e) above. 

BONNET 

MEMORY STOP 

STEM 

Fig. 6 

PLUG 

GASKET 

3

7.0 REPACKING CBV UNDER FULL 

SYSTEM PRESSURE 


7.1 Open valve fully to its memory setting and, on a 

piece of paper, record the valve setting. 

7.2 Remove the handwheel/indicator sleeve assembly 

as per 5.1 and 5.2. 

7.3 Loosen the lockcollar by turning it counter-clockwise 

until it seats against the top of the memory stop. 

7.4 Remove the memory stop/lockcollar assembly by 

turning the plastic memory stop counter-clockwise. 

7.5 Using the handwheel WITH THE INDICATOR 

SLEEVE REMOVED, turn the valve stem counterclockwise 

until the valve is fully open and will not 

turn any further (45 ft. Ibs.). A step on the valve plug 

has now been back-seated against the upper 

portion of the valve body (metal-to-metal). 

7.7 Clean exposed portion of valve stem (Do not 

scratch). 

7.8 Remove and replace the '0' ring and gasket. 

7.9 Install the valve bonnet. 

7.10 Replace memory stop/lockcollar assembly into the 

valve bonnet. 

7.11 Close the valve fully by turning the stem in a clockwise 

direction. Tightening valve bonnet is 

necessary to stop any leaks. 

7.12 Replace handwheel/indicator sleeve assembly per 

6.1 d) and a) above. 

7.13 Open valve to balance set point as recorded in 7.1. 

7.14 Reset memory per 5.0. 

7.6 The valve bonnet may now be removed. There may 

be slight leakage, as the metal-to-metal backseating 

does not provide a drip-tight seal. 

4

Handwheel Position 

8.0 FLOW CURVES 

STRAIGHT DESIGN 

CBV-21/2"S 



CBV-3" S 

CBV-4" S 



CBV-5" S 

CBV-6" S 

5

9.0 FLOW CURVES 

ANGLE DESIGN 






S.A. Armstrong Limited 

23 Bertrand Avenue 

Toronto, Ontario 

Canada, M1L 2P3 

Tel: (416) 755-2291 

Fax: (416) 759-9101 

Visit us at www.armstrongpumps.com 

Armstrong Pumps Limited 

Peartree Road, Stanway 

Colchester, Essex 

United Kingdom, C03 5JX 

Tel: 01206-579491 

Fax: 01206-760532 

© S.A. Armstrong Limited 1998 

6 

Armstrong Pumps Inc. 

93 East Avenue 

Buffalo, New York 

U.S.A. 14120-6594 

Tel: (716) 693-8813 

Fax: (716) 693-8970 

Armstrong Darling Inc. 

2200 Place Transcanadienne 

Montreal, Quebec 

Canada, H9P 2X5 

Tel: (514) 421-2424 

Fax: (514) 421-2436

Hard Flanged Circuit Balancing Valves - Armstrong Pumps

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