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■EPDT-179c■

Presumable cause III.18: Hexagon head bolt

○

on top diaphragm case becomes loose.

Action (41) : Retighten hexagon head bolt

○

of top diaphragm case.

Presumable cause III.19: Hexagon socket head cap bolt

○

and locknut

○

are

loosened.

Action (42) : Follow steps described in Actions (7) to (11) and then perform Actions (20) to (23).

Presumable cause III.20: Diaphragm

○

is damaged.

Action (43) : Follow steps described in Actions (7) to (12); replace diaphragm

○

After replacement,

perform steps in Actions (19) to (23).

Presumable cause III.21: Hexagon socket head cap bolt

⑥

on the bottom diaphragm

case is loosened or O-rings

③

and

④

are damaged

Action (44) : In case of loosened bolt: follow steps described in Actions (7) to (12). Retighten the

hexagon head bolt

⑥

. And then perform steps in Actions (19) to (23).

Action (45) : In the case O-ring is damaged, follow steps described in Actions (7) to (12). Unscrew

hexagon head bolt

⑥

. Remove the bottom diaphragm case and replace the O-ring.

→

Содержание GD-400

Страница 1: ...result in personal injury or damage to the equipment or facilities Contents 1 Product application 1 2 Specification 1 3 Dimensions and parts 2 4 Theory of operation 3 5 Nominal size selection 5 1 Pre...

Страница 2: ...a B 1 2 3 3 kPa C 3 0 8 0 kPa Reduced pressure D 7 0 20 kPa Operating temperature 5 60 Minimum pressure difference 2 0 kPa Maximum reduction ratio 400 1 Connection JIS 10K FF Flanged Body Cast iron St...

Страница 3: ...hragm 31 Spring Chamber 10 Disc 33 Lock Nut 11 Valve 34 Adjusting Screw 12 Spindle 35 Cap 15 Spring 37 Needle Valve 17 Bottom Cover 42 Eye Nut 3 Dimensions and parts GD 400 400SS Dimensions mm Nominal...

Страница 4: ...he diaphragm 22 as reduced pressure While the stop valve at the outlet is closed the pressure on the diaphragm 22 increases until it overcomes the load from the spring 29 allowing the disc to close Fl...

Страница 5: ...istics chart 5 3 Pressure characteristics chart The chart shows changes in the reduced pressure when the inlet pressure is decreased from 400 kPa to 10 kPa with the reduced pressure set at 8 0 kPa 7 0...

Страница 6: ...0 kPa line and reduced pressure 3 kPa line intercross Draw a line from the intersection straight down to the point B where it meets the line representing flow rate 15 m3 h normal condition The point B...

Страница 7: ...ressure is 2 5 kPa up to 200 kPa If P2 P1 2 If P2 P1 2 94 2 P P P G t 273 Q Cv 2 1 1 P 55 2 G t 273 Q Cv P1 Inlet pressure kPa A Q Max gas flow rate Nm3 h P2 Reduced pressure kPa A t Gas temperature P...

Страница 8: ...ible blowing fluid to a safety location If the blowing fluid is hot it will cause burn injury CAUTION 1 Do not disassemble the pressure reducing valve unless it must be Once incorrectly disassembled t...

Страница 9: ...connect the external sensing port to the outlet of the pressure reducing valve Otherwise the outlet pressure is equal to that at the inlet Wrong connection may cause malfunction of the pressure reduc...

Страница 10: ...alve ensure that the outlet pressure will not exceed the set pressure of the safety valve or the primary pressure regulating valve If the outlet pressure exceeds the set pressure of the safety valve o...

Страница 11: ...rclockwise 7 Gradually open the stop valve V2 and readjust outlet pressure to obtain the desired value 8 After completing the adjustment tighten the lock nut 33 and fit the cap 35 7 2 2 Pressure setti...

Страница 12: ...ively open turn CCW the needle valve Fluid will blow out If the fluid is hot you may suffer burns CAUTION Never completely close the needle valve The outlet pressure will increase and the safety valve...

Страница 13: ...tain the functions and performance of the pressure reducing valve perform periodic inspection User should refer such tasks to specialist maintenance agency or the manufacturer 2 Only properly trained...

Страница 14: ...ner at inlet is clogged 12 Clean the screen of the strainer 13 Needle valve 37 is clogged by foreign materials 13 Remove foreign material from needle valve 37 14 Foreign object pinched between diaphra...

Страница 15: ...14 EPDT 179c 8 3 Exploded view Fig 4 Exploded drawing Available as consumable part...

Страница 16: ...Verify smooth up down movement of the valve stem Jerky movement will cause malfuction 3 Verify that the seat diaphragm balance diaphragm and O ring are clean Dirty components will cause malfunction an...

Страница 17: ...hese parts are damaged Action 7 Remove the cap 35 Action 8 Loosen locknut 33 Loosen bifacial adjusting screw 34 by turning it CCW to relieve the spring load Action 9 Unscrew 6 hexagon head bolts 32 Re...

Страница 18: ...tempt to twist top diaphragm plate 23 23 23 23 any further This may damage the balance diaphragm Action 12 Loosen locknut 25 and remove washer 24 top diaphragm plate 23 diaphragm 22 bottom diaphragm p...

Страница 19: ...and slide of bottom guide 16 16 16 16 Probable cause I 9 Hexagon nut on the valve is loosened and take appropriate Action s as necessary Action 14 Check disc and valve seat for pinched foreign materi...

Страница 20: ...t Tightening torque 16 N m Action 18 Attach spindle disc valve spring washer a set of hexagon nuts and spring Secure bottom cover with 6 hexagon head bolts Tightening torque 20 N m Action 19 Attach O...

Страница 21: ...30 Secure spring chamber 31 with 6 hexagon head bolts 32 Action 23 Follow the procedure described in 7 2 Adjustment Presumable cause I 5 Hexagon socket head cap bolt 26 26 26 26 or and locknut 25 25 2...

Страница 22: ...n 29 Follow steps in Actions 7 to 12 Tighten hexagon socket head cap bolt Tightening torque 5 N m Go to Actions 19 to 23 Presumable cause I 11 Balance diaphragm 7 7 7 7 is damaged Action 30 Perform Ac...

Страница 23: ...mable cause II 15 Foreign object is pinched between spindle and slide of bottom guide Action 36 Follow steps described in Actions 27 Problem III External leakage Presumable cause III 16 Needle valve 3...

Страница 24: ...m 22 22 22 22 is damaged Action 43 Follow steps described in Actions 7 to 12 replace diaphragm 22 After replacement perform steps in Actions 19 to 23 Presumable cause III 21 Hexagon socket head cap bo...

Страница 25: ...24 EPDT 179c Action 46 Place the bottom diaphragm case and secure it with hexagon socket head cap bolt Tightening torque 12N m Action 47 Follow steps described in Actions 19 to 23...

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