svf torque tables

8/11/2019 SVF Torque Tables

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I N C O R P O R A T E D

SVFFlow Controls Torque

07.15.201

Tables

VALVE OPERATING TORQUE TABLES

Document: SVF_Torque_Ta

SVF Flow Controls, Inc. 13560 Larwin Circle Santa Fe Springs, CA 90670 Tel: 1.800.783.7836 FAX: 562.802.3114

[email protected] [email protected] Visit our website: www.SVF.net Specifcaons subject to change without noce

Definition of Valve TorqueThe purpose of this manual is to provide a simple yet accurate procedure for sizing actuators to

SVF ball valves. By properly sizing an actuator to a valve for a specific application, performance is

guaranteed and economics are gained.

VALVE TORQUE Before the actuator can be sized for any given valve application, the amount of torque

required by the valve must be determined. The operating torque of the ball valve is influenced by a

number of factors, some are design and material related, others are application (service condition)

related. Design related factors include the type and material of the valve seats. Application factors

include system pressure, media, and frequency of operation.

The torque required to operate a ball valve comes from two different areas within the valve, in both

cases resulting from friction between metal and relatively soft sealing materials. The two areas in thevalve that create torque are the stem and ball/seat.

STEM TORQUE is primarily dependent upon the tightness of the stem nut. Proper adjustment of the

stem nut is important to valve performance and life. If the nut is too loose, the valve exhibits stem

leakage; if the nut is too tight, the total torque requirement can be increased to the point where the

actuator may not be powerful enough to cycle the valve. The design of SVF ball valves is such that

the stem torque is constant, i.e. it is not influenced by operation conditions.

BALL/SEAT TORQUE is created by the friction between the ball and seat and is very sensitive to service

conditions. The floating ball design concept allows the system pressure to force the ball into the

downstream seat. The higher the system pressure, the harder the ball is forced into the seat and,therefore, the higher the torque. Since different seat materials have different coefficients of friction,

the ball/seat torque also becomes a function of the seat materials being used.

Valve torque is also a function of the media flowing through the valves. Abrasive media have a

tendency to increase the amount of friction between ball and seats, whereas some light oils, which

provide additional lubricity, can reduce the amount of torque required.

The torque required to operate a ball valve is maximum

at the beginning of opening. This is due to change in

the ball surface that is in contact with seats. The ball

surface contact with the seats is greatest when the

valve is closed.

A typical ball valve torque characteristic is demonstrated

in the graph shown on the left. Closing torque is about

80% of the opening or breakaway torque for the

softer resilient seats. For harder seats such as PEEK,

the opening and closing curves are nearly identical.

Torque curves in this publication are based on opening

curves.

RUNNING TORQUE

CLOSING TORQUE

OPENING TORQUE

CLOSED OPEN

TORQUE


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Tables





SIZE

1/43/81/23/411-1/41-1/22

in-lbf

45454545100130280360

Nm

555511153241

D8

in-lbf

50505050150175450600

Nm

666617205168

in-lbf

5050506090300375675

Nm

666710344276

in-lbf

50505075100150175275

Nm

666811172031

SIZE

1/43/81/23/411-1/41-1/222-1/23

in-lbf

454545451001302803605601000

Nm

55551115324163113

R89

in-lbf

5050506090300375675

--

Nm

666710344276--

in-lbf

50505075100150175275

--

Nm

666811172031--

Series 8continued

TFM1600 Seat Torque SupraLonTMSeat Torque DelrinSeat Torque UHMWPE Seat Torque

TFM1600 Seat Torque DelrinSeat Torque UHMWPE Seat Torque


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Tables





SIZE

1/43/81/23/411-1/4

1-1/22

in-lbf

45454545100130

280360

Nm

55551115

3241

TFM1600 Seat TorqueC8

Series 8continued

SIZE

1/23/411-1/41-1/22

in-lbf

4545100130280360

Nm

5511153241

TFM1600 Seat TorqueF8

SIZE

1/43/81/23/411-1/4

1-1/222-1/2

in-lbf

454545100130280

3605601000

Nm

555111532

4163113

TFM1600 Seat TorqueFB8

SIZE

1/43/81/23/411-1/41-1/222-1/23

in-lbf

505050501501754506009251500

Nm

666617205168105170

SupraLonTMSeat TorqueN8

SIZE

1/23/411-1/41-1/222-1/2

in-lbf

501501754506009251500

Nm

617205168105170

SupraLonTMSeat TorqueBN8

SIZE

1/43/81/23/411-1/41-1/222-1/23

in-lbf

454545451001302803605601000

Nm

55551115324163113

TFM1600 Seat Torque SupraLonTMSeat TorqueRJ8

in-lbf

505050501501754506009251500

Nm

666617205168105170


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Tables





SIZE

1/23/411-1/222-1/234

in-lbf

606010020025045013001400

Nm

7711232851147158

TFM1600 Seat TorqueSB7 CleanFLOW TM

SIZE

1/23/411-1/222-1/234

in-lbf

10014021049052090014001500

Nm

1116245559102158170

TFM1600 Seat TorqueSBC7

SIZE

1/23/411-1/22

in-lbf

6060100200250

Nm

77112328

TFM1600 Seat TorqueSB7F

SIZE

1/23/411-1/22

in-lbf

100140210490520

Nm

1116245559

TFM1600 Seat TorqueSBC7F

SIZE

1/23/411-1/222-1/234

in-lbf

4453931952834347171080

Nm

561122324981122

TFM1600 Seat TorqueSB9SIZE

1/23/411-1/222-1/234

in-lbf

4453931952834347171080

Nm

561122324981122

TFM1600 Seat TorqueSBC9


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Tables





SIZE

1/23/411-1/222-1/2

in-lbf

6060100200250450

Nm

7711232851

TFM1600 Seat TorqueTSB7

SIZE

1/23/411-1/22

in-lbf

6060100200250

Nm

77112328

TFM1600 Seat TorqueTSB7FSIZE

1/23/411-1/22

in-lbf

100140210490520

Nm

1116245559

TFM1600 Seat TorqueTSBC7F

SIZE1/23/411-1/22

in-lbf602003005501100

Nm7233462124

DelrinSeat TorqueH7

continuedSIZE

1/23/411-1/222-1/2

in-lbf

100140210490520900

Nm

1116245559102

TFM1600 Seat TorqueTSBC7

in-lbf662203306051210

Nm8253768137

PEEK Seat Torque

SIZE1/23/41

in-lbf55190290

Nm62233

DelrinSeat TorqueP4

in-lbf61209300

Nm72434

PEEK Seat Torque

SIZE

1/4

3/81/23/411-1/22

in-lbf

150

1501502003205751000

Nm

17

1717233665113

DelrinSeat TorqueHBEV

in-lbf

160

1601602203356101150

Nm

18

1818253869130

PEEK Seat Torque

CleanFLOW TM


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07.15.201

Tables





SIZE

1/43/81/23/411-1/41-1/22

in-lbf

3535355080120250300

Nm

44469142834

TFM1600 Seat TorqueEZ9

SIZE

34

in-lbf

9871009

Nm

112114

TFM1600 Seat TorqueFS7

SIZE

1-1/223

46

TFM1600 Seat Torque41Rev3

in-lbf

254368728

12091532

Nm

294282

137173

SupraLonTMSeat Torque

SIZE

1/23/41

1-1/222-1/23468

in-lbf

7281130

299371598988150841606500

Nm

8915

344268112171470735

TFM1600 Seat TorqueB41Rev3

in-lbf

9198172

3684607281209184652008060

Nm

101119

425282137209588911

SupraLonTMSeat Torqu

Flanged

SIZE

1/23/411-1/22

in-lbf

3166113240260

Nm

47132729

PTFE Seat TorqueBZ9

in-lbf

208299598

9881600

Nm

243468

112181

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