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Data sheet STV Series

Balancing Valves

VDDNB122 © Danfoss 05/08

Danfoss STV series of balancing valves provide

testing and balancing of circuit ﬂow for hydronic

heating or cooling systems.

STV valves provide a high level of balancing

accuracy using an easy to set multi-turn setting

wheel and memory lock.

Features:

Positive shut-oﬀ•

Built-in memory stop•

Multi-turn 360 hand wheel with vernier scale •

and digit readout

Oﬀset pressure/ temperature ports•

Presetting and locking with Allen key•

Applications/

Features:

Ordering

Information:

STV / STVL

Valve Size

Weight

lbs. (kg)

Cv* Connection Code No.

STVA

2-1/2” 31 (14) 110

ANSI

class 125

Flanged

065F8971

3” 45 (20) 128 065F8972

4” 58 (26) 222 065F8973

5” 90 (41) 350 065F8974

6” 112 (51) 495 065F8975

STVC

8” 275 (125) 696 065F8993

10” 490 (222) 1405 065F8994

12” 573 (260) 1764 065F8995

*Cv= Flow rate in GPM with a pressure drop of 1 psi.

STVA / STVC

Valve Size

Weight

lbs. (kg)

Cv*

Connection

NPT (STV) F. Solder (STVL)

STV /

STVL

1/2” 1.2 (0.5) 4.1 065F8965 065F896501

3/4” 1.3 (0.6) 5.9 065F8966 065F896601

1” 1.7 (0.8) 10.2 065F8967 065F896701

1-1/4” 2.7 (1.2) 15.2 065F8968 065F896801

1-1/2” 3.3 (1.5) 22.6 065F8969 065F896901

2” 5.1 (2.3) 36.5 065F8970 065F897001

Summary of content (8 pages)

PAGE 1
Data sheet STV Series Balancing Valves STV / STVL Applications/ Features: STVA / STVC Danfoss STV series of balancing valves provide testing and balancing of circuit flow for hydronic heating or cooling systems. STV valves provide a high level of balancing accuracy using an easy to set multi-turn setting wheel and memory lock.
PAGE 2
Data sheet STV Series Balancing Valves Accessories: Part Description Test Plug Gauge Adapter Measuring Needle Replacement hand wheel Technical Specifications: Code No. Red Tag 065F8985 Blue Tag 065F8986 1/2” to 2” valves (1/16” diameter, 1.75” length) 003Z40324 2-1/2” to 12” valves (1/8” diameter, 1.75” length) 003Z0326 Hand wheel, 1/2” to 2” 900693 Hand wheel, 2-1/2” to 6” 900694 Max.
PAGE 3
Data sheet STV Series Balancing Valves Install the balancing valve with the arrow on the valve’s body pointing in the direction of the flow in the system. Installation: To ensure an accurate reading, a straight length of 5 times the diameter of the pipe should be piped prior to the valve and a straight length of at least 2 times the pipe diameter should be piped after the valve.
PAGE 4
Data sheet STV Series Balancing Valves Flow Rate Graphs: STV/STVL Balancing Valves 1/2” - 2” 1 foot of head (FOH) = 0.434 psi Flow Rate Cv / Kv Number of Turns Opened 1. Plot the required flow rate and pressure drop within the columns and then draw a line between these plotted points. Pressure Drop 2. Draw an additional horizontal line from the intersection of the Cv column across the valve sizes. 3.
PAGE 5
Data sheet STV Series Balancing Valves Flow Rate Graphs: STVA Balancing Valves 2-1/2” - 6” 1 foot of head (FOH) = 0.434 psi 1. Plot the required flow rate and pressure drop within the columns and then draw a line between these plotted points. Flow Rate Cv / Kv Number of Turns Opened Pressure Drop 2. Draw an additional horizontal line from the intersection of the Cv column across the valve sizes. 3.
PAGE 6
Data sheet STV Series Balancing Valves Flow Rate Graphs: STVA Balancing Valves 8” - 12” 1 foot of head (FOH) = 0.434 psi 1. Plot the required flow rate and pressure drop within the columns and then draw a line between these plotted points. Flow Rate Cv / Kv Number of Turns Opened Pressure Drop 2. Draw an additional horizontal line from the intersection of the Cv column across the valve sizes. 3.
PAGE 7
Data sheet STV Series Balancing Valves Dimensions and Construction: C C B B A A STV Valve STVL Valve STV / STVL Size A in (mm) B in (mm) 1/2” 3.4 (86.4) 3.7 (93.9) 1.6 (40.6) 3/4” 3.5 (88.9) 3.7 (93.9) 1.7 (43.2) 1” 4.0 (104.1) 3.8 (96.5) 1.7 (43.2) 1-1/4” 4.7 (119.4) 3.8 (96.5) 1.9 (45.7) 1-1/2” 5.2 (132.1) 4.3 (109.2) 1.9 (45.7) 2” 6.1/6.5 (153.9/164.1)(1) 4.4 (111.7) 2.1 (53.1) STVL F.
PAGE 8
Data sheet STV Series Balancing Valves Typical specification: The balancing valve shall be of a brass construction and have female national pipe thread (NPT) or female solder connections. The valve shall be suitable for heating or cooling closed loop circuits. The balancing valve shall be capable of positive shut off and have P/T plug connections for testing. The valve adjustment shall be done via hand wheel hand wheel with digit readout within the handle of the valve.