The operating torque of the triple eccentric butterfly valve is calculated based on normal temperature and cleaning medium. For high temperature, low temperature conditions and non-clean media, it will lead to an increase in the operating torque of the triple eccentric butterfly valve.

During the opening and closing process of the three eccentric butterfly valve, the required opening and closing force and opening and closing torque are varied, and the maximum value is the initial moment of closing or the initial moment of opening. There are special requirements for the speed of the opening and closing process for some special working conditions.

We should know the actual operation torque to choose correct pneumatic or electric actuator. The correct choose of actuator could open the valve in time during operation.

 

1. The torque calculation of the triple eccentric butterfly valves is as follows:

(1)Valve Plate Area: S

Nominal diameter: D

S = (Dx1/2)2×3.14

(2)Static pressure on the shaft: P1

Nominal pressure: P

P1 = S x P

(3)Torque of triple eccentric butterfly valves: T , unit: N.M.

Friction coefficient: K (The friction coefficient of steel is 0.1, and the friction coefficient of steel to rubber is 0.15.)

Shaft diameter: d

T = P1 x K x d x 1/1000

(4)Electric actuator and pneumatic actuator normally apply the safety torque value according to 1.5 time of triple eccentric butterfly valve’s torque

2. Triple eccentric butterfly valve torque values are as follows:

SizeNominal Pressure
DNNPS0.6MPa1.0MPa1.6MPa2.5MPa4.0MPa6.3MPa285PSI740PSI1480PSI
502″37
6521/2″2935608210614269123213
803″345781102148290174271460
1004″61102141180259526250395834
1255″104165228289412641283548979
1506″17825045056479010604738252938
2008″2014006018001201156767415033616
25010″35351895612501860269798318875649
30012″63599213521711242831472022250811863
35014″819162322342844406748552520415814123
40016″1047194428423738553364733175627117061
45018″145124513452441264544239786421015
50020″2043328545275769825355311036126551
60024″27795548601894951344360111755938415
70028″6890
75030″323067237700165521265433105
80032″876052877
90036″5275847497502643818078
100040″691511717135602417980219
105042″81351525316270401103400024857
120048″125402056322360389004190036155
135054″183002180629977
140056″2465034900
150060″364403615543397
160064″4085048600
180072″
200080″
220088″
240096″
2600104″
2800112″
3000120″

 

 

 

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