Protecciones colectivas generales - Medidas de prevención de riesgos

4. Estudio de seguridad y salud

4.2. Medidas de prevención de riesgos

4.2.1. Protecciones colectivas generales

a The control valve is an add-on type where one service valve each can be added, so it is possi-ble to add valves or remove valves if necessary.

a The service valve is installed additionally between the top cover and lower valve.

a As for the 9-spool valve, only the parts different from the 8-spool valve are shown.

PC27MR-2

A5 : To bucket cylinder head A6 : To boom swing cylinder head A7 : To blade cylinder head A8 : To swing motor MA port B1 : To R.H. travel motor B2 : To L.H. travel motor B3 : To boom cylinder bottom B4 : To arm cylinder bottom B5 : To bucket cylinder bottom B6 : To boom swing cylinder bottom B7 : To blade cylinder bottom B8 : To swing motor MB port LS : To pump LS valve

P1 : From main pump to variable pump P2 : From main pump to gear pump S1 : To swing motor S port

PA1: From R.H. travel FORWARD PPC valve PA2: From L.H. travel FORWARD PPC valve PA3: From boom LOWER PPC valve

PA4: From arm OUT PPC valve PA5: From bucket DUMP PPC valve PA6: From boom swing R.H. PPC valve PA7: From blade RAISE PPC valve PA8: From swing L.H. PPC valve

PB1: From R.H. travel REVERSE PPC valve PB2: From L.H. travel REVERSE PPC valve PB3: From boom RAISE PPC valve

PB4: From arm IN PPC valve PB5: From bucket CURL PPC valve PB6: From boom swing L.H. PPC valve PB7: From blade LOWER PPC valve PB8: From swing R.H. PPC valve PP : To pump LS valve

PPPC : To solenoid valve P port PS : To swing motor BR port TS : To tank

CONTROL VALVE

(3)

STRUCTURE, FUNCTION AND MAINTENANCE STANDARD

1. 8 spool valve (1/5)

CONTROL VALVE

10-70-2

PC30 – 50MR-2 STRUCTURE, FUNCTION AND

MAINTENANCE STANDARD

(2/5)

CONTROL VALVE

(3)

STRUCTURE, FUNCTION AND MAINTENANCE STANDARD

1. Suction valve (boom bottom) 2. Suction valve (arm bottom) 3. Suction valve (bucket bottom) 4. Suction valve (blade bottom) 5. Safety valve

6. Suction valve (boom swing head) 7. Suction valve (bucket head) 8. Suction valve (boom head) 9. Spool (swing)

10. Spool (blade) 11. Spool (boom swing) 12. Spool (bucket) 13. Spool (arm) 14. Spool (boom) 15. Spool (L.H. travel) 16. Spool (R.H. travel) 17. Main relief valve

CONTROL VALVE

Unit: mm

No. Check item Criteria Remedy

18 Spool return spring

(Travel, boom, arm, bucket, boom swing, blade, swing)

Standard clearance Repair limit

Replace spring if dam-aged or deformed Free length

x OD Installed

length Installed

load Free

length Installed load 29.0 x 17.5 28.5 23.6 kN

{2.30 kg} — 18.1 kN

{1.80 kg}

10-70-4

PC30 – 50MR-2 STRUCTURE, FUNCTION AND

MAINTENANCE STANDARD

(3/5)

CONTROL VALVE

(3)

STRUCTURE, FUNCTION AND MAINTENANCE STANDARD

1. Buck pressure check valve

2. Self pressure reducing sequential valve 3. Pressure compensation valve

(flow control valve) (R.H. travel)

4. Pressure compensation valve (flow control valve)

(L.H. travel)

5. Pressure compensation valve (flow control valve) (boom) 6. Pressure compensation valve

(flow control valve) (arm) 7. Pressure compensation valve

(flow control valve) (bucket) 8. Pressure compensation valve

(flow control valve) (boom swing) 9. Swing relief valve (for gear pump) 10. Pressure compensation valve

(boom swing)

11. Pressure compensation valve (pressure reducing valve) (bucket)

12. Pressure compensation valve (pressure reducing valve) (arm)

13. Pressure compensation valve (pressure reducing valve) (boom)

14. Pressure compensation valve (pressure reducing valve) (L.H. travel)

15. Pressure compensation valve (pressure reducing valve) (R.H. travel)

16. LS bypass plug 17. Unload valve

18. Buck pressure check valve 19. Pressure compensation valve

(flow control valve) 20. Spool (travel)

21. Pressure compensation valve (pressure reducing valve) F: Flow control valve R: Pressure reducing valve

Unit: mm

No. Check item Criteria Remedy

22 Pressure compensation valve spring

Standard size Repair limit

Replace spring if dam-aged or deformed Free length

x OD Installed

length Installed

load Free

length Installed load

24 Buck pressure check valve spring 29.0 x 13.3 21.0 15.3 N

{1.56 kg} — 12.2 N

{1.25 kg}

25 Self pressure reducing sequence

valve spring 40.5 x 14.3 34.6 104 N

{10.6 kg} — 83.2 N

{8.48 kg}

26 Pressure compensation valve

spring 22.5 x 8.40 18.2 9.75 N

{0.99 kg} — 7.8 N

{0.80 kg}

CONTROL VALVE

10-70-6

PC30 – 50MR-2 STRUCTURE, FUNCTION AND

MAINTENANCE STANDARD

(4/5)

CONTROL VALVE

(3)

STRUCTURE, FUNCTION AND MAINTENANCE STANDARD

1. Self pressure reducing spool 2. Self reducing sequential valve 3. Main relief valve

4. LS bypass valve 5. Unload valve

6. Self pressure reducing valve 7. Pressure compensation valve

(flow control valve) 8. Spool (boom) 9. Suction valve 10. Check valve 11. Suction valve

12. Pressure compensation valve (pressure reducing valve) 13. Pressure compensation valve

(flow control valve) 14. Pilot check valve 15. Spool (arm) 16. Suction valve 17. Check valve

18. Pressure compensation valve (pressure reducing valve) 19. Pressure compensation valve

(flow control valve) 20. Spool (bucket) 21. Suction valve 22. Check valve 23. Suction valve

24. Pressure compensation valve (pressure reducing valve) F: Flow control valve R: Pressure reducing valve

CONTROL VALVE

Unit: mm

No. Check item Criteria Remedy

25 Check valve spring (Boom, arm, bucket)

Standard clearance Repair limit

Replace spring if dam-aged or deformed Free length

x OD Installed

length Installed

load Free

length Installed load 21.9 x 5.0 15.8 1.96 N

{0.20 kg} — 1.57 N

{0.16 kg}

10-70-8

PC30 – 50MR-2 STRUCTURE, FUNCTION AND

MAINTENANCE STANDARD

(5/5)

CONTROL VALVE

(3)

STRUCTURE, FUNCTION AND MAINTENANCE STANDARD

1. Pressure compensation valve (flow control valve)

2. Spool (boom swing) 3. Check valve 4. Suction valve

5. Pressure compensation valve (pressure reducing valve) 6. Pilot pressure check valve 7. Spool (swing)

8. Swing relief valve (for gear pump) 9. Pilot pressure check valve 10. Spool (blade)

11. Suction valve 12. Check valve 13. Air bleeding plug 14. Safty valve circuit filter 15. Safty valve

F : Flow control valve R : Pressure reducing valve

CONTROL VALVE

Unit: mm

No. Check item Criteria Remedy

16 Check valve spring (Boom swing, blade)

Standard clearance Repair limit

Replace spring if dam-aged or deformed Free length

x OD Installed

length Installed

load Free

length Installed load 21.9 x 5.0 15.8 1.96 N

{0.20 kg} — 1.57 N

{0.16 kg}

10-70-10

PC30 – 50MR-2 STRUCTURE, FUNCTION AND

MAINTENANCE STANDARD

2. 9 spool valve

CONTROL VALVE

(3)

STRUCTURE, FUNCTION AND MAINTENANCE STANDARD

A9: To stop valve B9: To stop valve

PA9: To attachment PPC valve PB9: To attachment PPC valve

1. Pressure compensation valve (F attachment) 2. Pressure compensation valve (R attachment) 3. Spool (Attachment)

4. Port relief valve F: Flow control valve R: Pressure reducing valve

Unit: mm

No. Check item Criteria Remedy

5 Pressure compensation valve spring

Standard size Repair limit

Replace spring if dam-aged or deformed Free length

x OD Installed

length Installed

load Free

length Installed load 20.0 x 8.40 12.0 6.86 N

{0.70 kg} — 5.49 N

{0.56 kg}

6 Spool return spring (Attachment) 29.0 x 17.5 28.5 22.6 N

{2.30 kg} — 18.1 N

{1.80 kg}

CONTROL VALVE

10-70-12

PC30 – 50MR-2 STRUCTURE, FUNCTION AND

MAINTENANCE STANDARD

PC30MR-2

P1 : From main pump to variable pump P2 : From main pump to gear pump S1 : To swing motor S port

PA1: From R.H. travel FORWARD PPC valve PA2: From L.H. travel FORWARD PPC valve PA3: From boom LOWER PPC valve

PA4: From arm OUT PPC valve PA5: From bucket DUMP PPC valve PA6: From boom swing R.H. PPC valve PA7: From blade RAISE PPC valve PA8: From swing L.H. PPC valve

PB1: From R.H. travel REVERSE PPC valve PB2: From L.H. travel REVERSE PPC valve PB3: From boom RAISE PPC valve

PB4: From arm IN PPC valve PB5: From bucket CURL PPC valve PB6: From boom swing L.H. PPC valve PB7: From blade LOWER PPC valve PB8: From swing R.H. PPC valve PP : To pump LS valve

PPPC : To solenoid valve P port PS : To swing motor BR port TS : To tank

CONTROL VALVE

(3)

STRUCTURE, FUNCTION AND MAINTENANCE STANDARD

1. 8 spool valve (1/5)

CONTROL VALVE

10-72

PC30 – 50MR-2 STRUCTURE, FUNCTION AND

MAINTENANCE STANDARD

(2/5)

CONTROL VALVE

STRUCTURE, FUNCTION AND MAINTENANCE STANDARD

1. Safety valve

2. Suction valve (boom bottom) 3. Suction valve (arm bottom) 4. Suction valve (bucket bottom) 5. Suction valve (blade bottom) 6. Suction valve (boom swing head) 7. Suction valve (bucket head) 8. Suction valve (boom head) 9. Spool (swing)

10. Spool (blade) 11. Spool (boom swing) 12. Spool (bucket) 13. Spool (arm) 14. Spool (boom) 15. Spool (L.H. travel) 16. Spool (R.H. travel) 17. Main relief valve

CONTROL VALVE

Unit: mm

No. Check item Criteria Remedy

Spool return spring

(Travel, boom, arm, bucket, boom swing, blade, swing)

Standard clearance Repair limit

Replace spring if dam-aged or deformed Free length

x OD

Installed length

Installed load

Free length

Installed load 29.0 x 17.5 28.5 23.6 kN

{2.30 kg} — 18.1 kN

{1.80 kg}

10-74

PC30 – 50MR-2 STRUCTURE, FUNCTION AND

MAINTENANCE STANDARD

(3/5)

CONTROL VALVE

STRUCTURE, FUNCTION AND MAINTENANCE STANDARD

1. Buck pressure check valve

2. Self pressure reducing sequential valve 3. Pressure compensation valve

(flow control valve) (R.H. travel)

4. Pressure compensation valve (flow control valve)

(L.H. travel)

5. Pressure compensation valve (flow control valve) (boom) 6. Pressure compensation valve

(flow control valve) (arm) 7. Pressure compensation valve

(flow control valve) (bucket) 8. Pressure compensation valve

(flow control valve) (boom swing) 9. Swing relief valve (for gear pump) 10. Pressure compensation valve

(boom swing)

11. Pressure compensation valve (pressure reducing valve) (bucket)

12. Pressure compensation valve (pressure reducing valve) (arm)

13. Pressure compensation valve (pressure reducing valve) (boom)

14. Pressure compensation valve (pressure reducing valve) (L.H. travel)

15. Pressure compensation valve (pressure reducing valve) (R.H. travel)

16. LS bypass plug 17. Unload valve 18. Cooler bypass valve

19. Pressure compensation valve (flow control valve)

20. Spool (travel)

21. Pressure compensation valve (pressure reducing valve) 22. Buck pressure check valve 23. Cooler bypass valve F: Flow control valve R: Pressure reducing valve

Unit: mm

No. Check item Criteria Remedy

24 Pressure compensation valve spring

Standard size Repair limit

Replace spring if dam-aged or deformed Free length

x OD Installed

length Installed

load Free

length Installed load

27 Buck pressure check valve spring 29.0 x 13.3 21.0 15.3 N

{1.56 kg} — 12.2 N

{1.25 kg}

28 Self pressure reducing sequence

valve spring 40.5 x 14.3 34.6 104 N

{10.6 kg} — 83.2 N

{8.48 kg}

29 Pressure compensation valve

spring 22.5 x 8.40 18.2 9.75 N

{0.99 kg} — 7.8 N

{0.80 kg}

CONTROL VALVE

10-76

PC30 – 50MR-2 STRUCTURE, FUNCTION AND

MAINTENANCE STANDARD

(4/5)

CONTROL VALVE

(1)

STRUCTURE, FUNCTION AND MAINTENANCE STANDARD

1. Self pressure reducing spool 2. Self reducing sequential valve 3. Safety valve

4. Main relief valve 5. LS bypass valve 6. Unload valve

7. Self pressure reducing valve 8. Pressure compensation valve

(flow control valve) 9. Spool (boom) 10. Suction valve 11. Check valve 12. Suction valve

13. Pressure compensation valve (pressure reducing valve) 14. Pressure compensation valve

(flow control valve) 15. Pilot check valve 16. Spool (arm) 17. Suction valve 18. Check valve

19. Pressure compensation valve (pressure reducing valve) 20. Pressure compensation valve

(flow control valve) 21. Spool (bucket) 22. Suction valve 23. Check valve 24. Suction valve

25. Pressure compensation valve (pressure reducing valve) F: Flow control valve R: Pressure reducing valve

CONTROL VALVE

Unit: mm

No. Check item Criteria Remedy

26 Check valve spring (Boom, arm, bucket)

Standard clearance Repair limit

Replace spring if dam-aged or deformed Free length

x OD Installed

length Installed

load Free

length Installed load 21.9 x 5.0 15.8 1.96 N

{0.20 kg} — 1.57 N

{0.16 kg}

10-78

PC30 – 50MR-2 STRUCTURE, FUNCTION AND

MAINTENANCE STANDARD

(5/5)

CONTROL VALVE

STRUCTURE, FUNCTION AND MAINTENANCE STANDARD

1. Pressure compensation valve (flow control valve)

2. Spool (boom swing) 3. Check valve 4. Suction valve

5. Pressure compensation valve (pressure reducing valve) 6. Pilot pressure check valve 7. Spool (swing)

8. Swing relief valve (for gear pump) 9. Pilot pressure check valve 10. Spool (blade)

11. Suction valve 12. Check valve 13. Air bleeding plug F : Flow control valve R : Pressure reducing valve

CONTROL VALVE

Unit: mm

No. Check item Criteria Remedy

14 Check valve spring (Boom swing, blade)

Standard clearance Repair limit

Replace spring if dam-aged or deformed Free length

x OD Installed

length Installed

load Free

length Installed load 21.9 x 5.0 15.8 1.96 N

{0.20 kg} — 1.57 N

{0.16 kg}

10-79-1

PC30 – 50MR-2 STRUCTURE, FUNCTION AND

MAINTENANCE STANDARD

2. 9 spool valve

CONTROL VALVE

STRUCTURE, FUNCTION AND MAINTENANCE STANDARD

A9: To stop valve B9: To stop valve

PA9: To attachment PPC valve PB9: To attachment PPC valve

1. Pressure compensation valve (F attachment) 2. Pressure compensation valve (R attachment) 3. Spool (Attachment)

4. Port relief valve

F: Flow control valve R: Pressure reducing valve

Unit: mm

No. Check item Criteria Remedy

5 Pressure compensation valve spring

Standard size Repair limit

Replace spring if dam-aged or deformed Free length

x OD

Installed length

Installed load

Free length

Installed load 20.0 x 8.40 12.0 6.86 N

{0.70 kg} — 5.49 N

{0.56 kg}

6 Spool return spring 29.0 x 17.5 28.5 22.6 N

{2.30 kg} — 18.1 N

{1.80 kg}

CONTROL VALVE

10-80

PC30 – 50MR-2 STRUCTURE, FUNCTION AND

MAINTENANCE STANDARD

PC35MR, 40MR, 50MR-2

C : To oil cooler A5 : To bucket cylinder head A6 : To boom swing cylinder head A7 : To blade cylinder head A8 : To swing motor MB port B1 : To L.H. travel motor B2 : To R.H. travel motor B3 : To boom cylinder bottom B4 : To arm cylinder bottom B5 : To bucket cylinder bottom B6 : To boom swing cylinder bottom B7 : To blade cylinder bottom B8 : To swing motor MA port LS : To pump LS valve

P1 : From main pump to variable pump P2 : From main pump to variable pump P3 : From main pump to gear pump

PA1 : From left travel FORWARD PPC valve PA2 : From right travel FORWARD PPC valve PA3 : From boom LOWER PPC valve

PA4 : From arm OUT PPC valve PA5 : From bucket DUMP PPC valve PA6 : From boom swing R.H. PPC valve PA7 : From blade RAISE PPC valve PA8 : From swing L.H. PPC valve

PB1 : From left travel REVERSE PPC valve PB2 : From right travel REVERSE PPC valve PB3 : From boom RAISE PPC valve

PB4 : From arm IN PPC valve PB5 : From bucket CURL PPC valve PB6 : From boom swing L.H. PPC valve PB7 : From blade LOWER PPC valve PB8 : From swing R.H. PPC valve PLS1 : Left travel LS pressure PLS2 : Right travel LS pressure PLS3 : Work equipment LS pressure PP : To pump LS valve

PP1 : P1 pump pressure PP2 : P2 pump pressure

PP3 : Pump pressure on work equipment side PS : To swing motor B port

TS : To tank

CONTROL VALVE

STRUCTURE, FUNCTION AND MAINTENANCE STANDARD

1. 8 spool valve (1/6)

CONTROL VALVE

10-82

PC30 – 50MR-2 STRUCTURE, FUNCTION AND

MAINTENANCE STANDARD

(2/6)

a The (27) shows PC50MR-2.

CONTROL VALVE

STRUCTURE, FUNCTION AND MAINTENANCE STANDARD

1. Suction valve (travel) 2. Suction valve (travel) 3. Suction valve (boom bottom) 4. Suction valve (arm bottom) 5. Suction valve (bucket bottom) 6. Suction valve (blade bottom) 7. Safety valve

8. Suction valve (blade head) 9. Suction valve (boom swing head) 10. Suction valve (bucket head) 11. Suction valve (arm head) 12. Suction valve (boom head) 13. Main relief valve

14. Suction valve (travel) 15. Suction valve (travel) 16. Spool (L.H. travel) 17. Spool (R.H. travel) 18. Unload valve 19. Spool (boom) 20. Spool (arm) 21. Spool (bucket) 22. Spool (boom swing) 23. Spool (blade) 24. Spool (swing) 25. Unload valve

CONTROL VALVE

Unit: mm

No. Check item Criteria Remedy

Spool return spring

(Travel, boom lower, arm, bucket, boom swing, swing, blade)

Standard size Repair limit

Replace spring if dam-aged or deformed Free length

x OD Installed length

Installed

load Free

length Installed load 29.0 x 17.5 28.5 22.6 N

{2.30 kg} — 18.1 N

{1.80 kg}

27 Spool return spring

(Boom RAISE) 29.0 x 17.5 28.5 21.6 N

{2.2 kg} — 17.28 N

{1.76 kg}

28 Spool return spring

(Boom RAISE) 13.1 x 16.7 8.5 55.4 N

{5.7 kg} — 44.3 N

{4.6 kg}

29 Spool return spring

(Boom RAISE) 20.3 x 17.6 19 55.4 N

10-84

PC30 – 50MR-2 STRUCTURE, FUNCTION AND

MAINTENANCE STANDARD

(3/6)

CONTROL VALVE

STRUCTURE, FUNCTION AND MAINTENANCE STANDARD

1. Lift check valve

2. Pressure compensation valve (F/Left travel) 3. Pressure compensation valve (F/Right travel) 4. Spool (Pump merge-divider valve)

5. Pressure compensation valve (F/Boom) 6. Pressure compensation valve (F/Arm) 7. Pressure compensation valve (F/Bucket) 8. Pressure compensation valve (F/Boom swing) 9. Swing relief valve (For gear pump)

10. Pressure compensation valve (R/Boom swing) 11. Pressure compensation valve (R/Bucket) 12. Pressure compensation valve (R/Arm) 13. Pressure compensation valve (R/Boom) 14. LS bypass plug (LS2)

15. Pressure compensation valve (R/Right travel) 16. Pressure compensation valve (R/Left travel) 17. Cooler bypass valve

18. Spool (Left travel) 19. Suction valve 20. Suction valve F : Flow control valve R : Pressure reducing valve

CONTROL VALVE

Unit: mm

No. Check item Criteria Remedy

21 Pressure compensation valve spring

Standard size Repair limit

Replace spring if dam-aged or deformed Free length

x OD Installed length

Installed

load Free

length Installed load 20.0 x 8.40 12.0 6.86 N

{0.70 kg} — 5.49 N

{0.59 kg}

22 Pressure compensation valve

spring 22.1 x 8.4 17.0 10.4 N

{1.06 kg} — 8.3 N

{0.85 kg}

23 Pressure compensation valve

spring 22.6 x 8.4 17.0 8.34 N

{0.85 kg} — 6.7 N

{0.68 kg}

24 Junction valve spring 41.1 x 13.8 22.0 44.3 N

{4.52 kg} — 35.5 N

{3.62 kg}

25 Buck pressure check valve spring 29.0 x 13.3 21.0 15.3 N

{1.56 kg} — 12.3 N

{1.25 kg}

26 Oil cooler check valve spring 27.2 x 13.2 21.0 78.9 N

{8.04 kg} — 63.0 N

{6.43 kg}

10-86

PC30 – 50MR-2 STRUCTURE, FUNCTION AND

MAINTENANCE STANDARD

(4/6)

CONTROL VALVE

STRUCTURE, FUNCTION AND MAINTENANCE STANDARD

1. Pressure compensation valve (F/Right travel) 2. Spool (Right travel)

3. Suction valve 4. Suction valve

5. Pressure compensation valve (R/Right travel) 6. Unload valve

7. Check valve 8. Main relief valve 9. Unload valve

10. LS bypass plug (LS2)

11. Spool (Pump merge-divider valve) 12. Unload valve

13. Check valve 14. Unload valve

15. Pressure compensation valve (F/Boom) 16. Spool (Boom)

17. Suction valve

18. Boom hydraulic drift prevention valve 19. Check valve

20. Check valve 21. Suction valve

22. Pressure compensation valve (R/Boom) F : Flow control valve

R : Pressure reducing valve

CONTROL VALVE

Unit: mm

No. Check item Criteria Remedy

23 Check valve spring

Standard size Repair limit

Replace spring if dam-aged or deformed Free length

x OD Installed

length Installed

load Free

length Installed load

10-88

PC30 – 50MR-2 STRUCTURE, FUNCTION AND

MAINTENANCE STANDARD

(5/6)

CONTROL VALVE

STRUCTURE, FUNCTION AND MAINTENANCE STANDARD

1. Pressure compensation valve (F/Arm) 2. Spool (Arm)

3. Suction valve 4. Check valve 5. Suction valve

6. Pressure compensation valve (R/Arm) 7. Pressure compensation valve (F/Bucket) 8. Spool (Bucket)

9. Suction valve 10. Check valve 11. Suction valve

12. Pressure compensation valve (R/Bucket) 13. Pressure compensation valve (F/Boom swing) 14. Spool (Boom swing)

15. Check valve 16. Suction valve

17. Pressure compensation valve (R/Boom swing) 18. Spool (Blade)

19. Suction valve 20. Check valve 21. Suction valve F : Flow control valve R : Pressure reducing valve

CONTROL VALVE

Unit: mm

No. Check item Criteria Remedy

22 Check valve spring

(Arm, bucket, boom swing, blade)

Standard clearance Repair limit

Replace spring if dam-aged or deformed Free length

x OD

Installed length

Installed load

Free length

Installed load 21.9 x 5.0 15.8 1.96 N

{0.20 kg} — 1.57 N

{0.16 kg}

10-90

PC30 – 50MR-2 STRUCTURE, FUNCTION AND

MAINTENANCE STANDARD

(6/6)

1. Spool (Swing)

2. Swing relief valve (For gear pump) 3. Safety valve

4. Pressure relief plug

CONTROL VALVE

STRUCTURE, FUNCTION AND MAINTENANCE STANDARD

2. 9 spool valve

CONTROL VALVE

PC30 – 50MR-2

10-90-3

STRUCTURE, FUNCTION AND MAINTENANCE STANDARD

A9: To stop valve or quick coupler B9: To stop valve or quick coupler PA9: To attachment PPC valve PB9: To attachment PPC valve

1. Pressure compensation valve (F attachment) 2. Pressure compensation valve (R attachment) 3. Spool (Attachment)

4. Port relief valve F: Flow control valve R: Pressure reducing valve

Unit: mm

No. Check item Criteria Remedy

5 Pressure compensation valve spring

Standard size Repair limit

Replace spring if dam-aged or deformed Free length

x OD Installed

length Installed

load Free

length Installed load 20.0 x 8.40 12.0 6.86 N

{0.70 kg} — 5.49 N

{0.56 kg}

6 Spool return spring (Attachment) 29.0 x 17.5 28.5 22.6 N

{2.30 kg} — 18.1 N

{1.80 kg}

CONTROL VALVE

(3)

STRUCTURE, FUNCTION AND MAINTENANCE STANDARD

CLSS

In document PROYECTO DE CÁLCULO DE LA ESTRUCTURA DE UNA NAVE INDUSTRIAL (página 37-41)