Stem Coefficient of Friction = 0.96815 (24 SF−dPITCH tan(α))

24 SF tan(α) +dPITCH

Opening Stroke데 이 터 취 득 지 점

(Unwedging/Unseating)

Closing Stroke

데 이 터 취 득 지 점

(Torque S/W T rip)

dPITCHDS −

pstem

2

pstem

lstem

tan(α )lstem

π dPITCH

Nominal Thread Pressure [psi ] =Stem Thrust

π (Stem O.D. − pstem

2)

pstem

2

게이트밸브 정적시험 열림시 Unwedging PointFlexible Disk

0

2

4

6

8

10

12

-0.1

8

-0.1

6

-0.1

4

-0.1

2

-0.1

0

-0.0

8

-0.0

5

-0.0

3

-0.0

1

0.0

1

0.0

3

0.0

5

0.0

7

0.0

9

0.1

1

0.1

3

0.1

5

0.1

7

0.2

0

0.2

2

0.2

4

0.2

6

0.2

8

0.3

0

0.3

2

S t e m F r i c t i o n C o e f f i c i e n t

Pro

babili

ty D

ensi

ty F

unction

Experimental P.D.F.

Gaussian P.D.F.

게이트밸브 정적시험 열림시 Unwedging PointFlexible Disk

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

-0.08 -0.05 -0.02 0.02 0.05 0.08 0.11 0.14 0.17 0.20

Stem Friction Coefficient

Pro

babili

ty D

istrib

ution

Experimental CUM.

Gaussian CUM.

게 이 트 밸 브 정 적 시 험 열 림 시 Unwedging PointFlex ib le Wedge Disk

0.00

0.05

0.10

0.15

0.20

0.25

0.30

0 10000 20000 30000 40000 50000 60000 70000 80000 90000 100000

T h r e a d P r e s s u r e ( p s i )

Ste

m C

oeff

icie

nt of

Coeff

icie

nt

게이트밸브 정적시험 닫힘시 Torque Switch Trip PointFlexible Disk

0

2

4

6

8

10

12

14

-0.1

7

-0.1

5

-0.1

3

-0.1

1

-0.0

8

-0.0

6

-0.0

4

-0.0

2

0.0

1

0.0

3

0.0

5

0.0

7

0.0

9

0.1

2

0.1

4

0.1

6

0.1

8

0.2

0

0.2

2

0.2

5

0.2

7

0.2

9

0.3

2

0.3

4

Pro

babili

ty D

ensi

ty F

unction

Experimental P.D.F.

Gaussian P.D.F.

게이트밸브 정적시험 닫힘시 Torque Switch Trip PointFlexible Disk

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

-0.17 -0.12 -0.07 -0.02 0.03 0.08 0.13 0.18 0.23 0.28

Stem Friction Coefficient

Pro

babili

ty D

istrib

ution

Experimental CUM.

Gaussian CUM.

글 로 브 밸 브 정 적 시 험 닫 힘 시 Torque Swi tch Tr ip PointUnbalance Type

0.00

0.05

0.10

0.15

0.20

0.25

0.30

0 10000 20000 30000 40000 50000 60000 70000 80000 90000 100000

T h r e a d P r e s s u r e ( p s i )

Ste

m C

oeff

icie

nt of

Friction

게 이 트 밸 브 정 적 시 험 닫 힘 시 T o rque Switch Tr ip PointFlex ible Disk

0.00

0.05

0.10

0.15

0.20

0.25

0.30

0 10000 20000 30000 40000 50000 60000 70000 80000 90000 100000

T h r e a d P r e s s u r e ( p s i )

Ste

m C

oeff

icie

nt of

Friction

글로브밸브 정적시험 닫힘시 Torque Switch Trip PointUnbalance Type

0

2

4

6

8

10

12

14

16

-0.11 -0.08 -0.04 0.00 0.04 0.08 0.11 0.15 0.19 0.23 0.27 0.30 0.34

S t e m F r i c t i o n C o e f f i c i e n t

Pro

babili

ty D

ensi

ty F

unction

Experimental P.D.F.

Gaussian P.D.F.

글로브밸브 정적시험 닫힘시 Torque Switch Tr ip PointUnbalance Type

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

-0.02 0.01 0.04 0.07 0.10 0.13 0.16 0.19 0.22

S tem Fr ict ion Coefficient

Pro

babili

ty D

istrib

ution

E xpe r imen ta l CUM.

Gauss i an CUM.

게이트밸브 Unwedging( ALVANIA)Population Size : 41 EA

0.00

0.05

0.10

0.15

0.20

0.25

0.30

0 10000 20000 30000 40000 50000 60000 70000 80000

T h r e a d P r e s s u r e

Ste

m C

oeff

icie

nt of

Fric

tion

μ(COF)

AVG.(0.111)

게이트밸브 Unwedging(EXXON NEBULA EP0)Population Size : 34EA

0.00

0.05

0.10

0.15

0.20

0.25

0.30

0 10000 20000 30000 40000 50000 60000 70000 80000

T h r e a d P r e s s u r e

Ste

m C

oeff

icie

nt of

Fric

tion

μ(COF)

AVG.(0.067)

게이트밸브 Unwedging(EXXON NEBULA EP1)

Population Size : 7EA

0.00

0.05

0.10

0.15

0.20

0.25

0.30

0 10000 20000 30000 40000 50000 60000 70000 80000

Thread Pressure

Ste

m C

oeff

icie

nt of

Friction

μ(COF)

AVG.(0.085)

게이트밸브 Unwedging(MOBILUX EP0 )Population Size : 102EA

0.00

0.05

0.10

0.15

0.20

0.25

0.30

0 10000 20000 30000 40000 50000 60000 70000 80000

T h r e a d P r e s s u r e

Ste

m C

oeff

icie

nt of

Fric

tion

μ(COF)

AVG.(0.104)

게이트밸브 Unwedging(MULTIFAK EP0)Population Size : 10EA

0.00

0.05

0.10

0.15

0.20

0.25

0.30

0 10000 20000 30000 40000 50000 60000 70000 80000

T h r e a d P r e s s u r e

Ste

m C

oeff

icie

nt of

Fric

tion

μ(COF)

AVG.(0.133)

게이트밸브 Unwedging(MULTIFAK EP2)Population Size : 29EA

0.00

0.05

0.10

0.15

0.20

0.25

0.30

0.35

0 10000 20000 30000 40000 50000 60000 70000 80000

T h r e a d P r e s s u r e

Ste

m C

oeff

icie

nt of

Fric

tion

μ(COF)

AVG.(0.098)

게이트밸브 Torque Swi tch Tr ip( ALVANIA)Population Size : 30 EA

0.00

0.05

0.10

0.15

0.20

0.25

0.30

0 10000 20000 30000 40000 50000 60000 70000 80000

T h r e a d P r e s s u r e

Ste

m C

oeff

icie

nt of

Fric

tion

μ(COF)

AVG.(0.123)

게이트밸브 Torque Swi tch Tr ip(EXXON NEBULA EP0)Population Size : 12EA

0.00

0.05

0.10

0.15

0.20

0.25

0.30

0 10000 20000 30000 40000 50000 60000 70000 80000

T h r e a d P r e s s u r e

Ste

m C

oeff

icie

nt of

Fric

tion

μ(COF)

AVG.(0.110)

게이트밸브 Torque Swi tch Tr ip(MOBILUX EP0 )Population Size : 86EA

0.00

0.05

0.10

0.15

0.20

0.25

0.30

0 10000 20000 30000 40000 50000 60000 70000 80000

T h r e a d P r e s s u r e

Ste

m C

oeff

icie

nt of

Fric

tion

μ(COF)

AVG.(0.123)

게이트밸브 Torque Switch Tr ip(MULTIFAK EP0)Population Size : 3EA

0.00

0.05

0.10

0.15

0.20

0.25

0.30

0 10000 20000 30000 40000 50000 60000 70000 80000

T h r e a d P r e s s u r e

Ste

m C

oeff

icie

nt of

Fric

tion

μ(COF)

AVG.(0.198)

게이트밸브 Torque Switch Tr ip(MULTIFAK EP2)Population Size : 32EA

0.00

0.05

0.10

0.15

0.20

0.25

0.30

0 10000 20000 30000 40000 50000 60000 70000 80000

Thread Pressure

Ste

m C

oeff

icie

nt of

Friction

μ(COF)

AVG.(0.103)

게이트밸브 Torque Switch Tr ip(UNIREX-2)Population Size : 72EA

0.00

0.05

0.10

0.15

0.20

0.25

0.30

0 10000 20000 30000 40000 50000 60000 70000 80000

Thread Pressure

Ste

m C

oeff

icie

nt of

Friction

μ(COF)

AVG.(0.120)

게이트밸브 Unwedging(UNIREX-2)Population Size : 77EA

0.00

0.05

0.10

0.15

0.20

0.25

0.30

0 10000 20000 30000 40000 50000 60000 70000 80000

Thread Pressure

Ste

m C

oeff

icie

nt of

Friction

μ(COF)

AVG.(0.088)

글로브밸브 Torque Swi tch Tr ip(ALVANIA)

Population Size : 32EA

0.00

0.05

0.10

0.15

0.20

0.25

0.30

0 10000 20000 30000 40000 50000 60000

T h r e a d P r e s s u r e

Ste

m C

oeff

icie

nt of

Fric

tion

μ(COF)

AVG.(0.111)

글로브밸브 Torque Swi tch Tr ip(EXXON NEBULA EP0)

Population Size : 22EA

0.00

0.05

0.10

0.15

0.20

0.25

0.30

0 10000 20000 30000 40000 50000 60000

T h r e a d P r e s s u r e

Ste

m C

oeff

icie

nt of

Fric

tion

μ(COF)

AVG.(0.086)

글로브밸브 Torque Swi tch Tr ip(MOBILUX EP0 )Population Size : 23EA

0.00

0.05

0.10

0.15

0.20

0.25

0.30

0 10000 20000 30000 40000 50000 60000

Th r e ad P r e s s u r e

Ste

m C

oeff

icie

nt of

Friction

μ(COF)

AVG.(0.072)

글로브밸브 Torque Switch Tr ip(MULTIFAK EP0)Population Size : 18EA

0.00

0.05

0.10

0.15

0.20

0.25

0.30

0 10000 20000 30000 40000 50000 60000

T h r e a d P r e s s u r e

Ste

m C

oeff

icie

nt of

Fric

tion

μ(COF)

AVG.(0.126)

글로브밸브 Torque Switch Tr ip(MULTIFAK EP2)Population Size : 22EA

0.00

0.05

0.10

0.15

0.20

0.25

0.30

0 10000 20000 30000 40000 50000 60000 70000

T h r e a d P r e s s u r e

Ste

m C

oeff

icie

nt of

Fric

tion

μ(COF)

AVG.(0.104)