Eaton Vickers RF Series Manuale utente

I-3332-SRevised 9/1/87

Pressure Control Valves

Hydro-Cushion Type

RF, RG and RT Series

RCF, RCG and RCT Series

Vickers®

Pressure Relief

Overhaul Manual

EEaton Hydraulics, Incorporated 2000

Table of Contents

Section Page

I. Operating Characteristics 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 1. Installation and Parts Drawings 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 2. Model Code Breakdown 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

II. Description 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 1. 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

III. Installation 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 2. 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

IV. Operation 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

V. Special Features 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 3. 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VI.Overhaul 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A. Disassembly 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

B. Reassembly 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figure 4. 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 3. Trouble Shooting Chart 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Section I – Operating Characteristics

Type Hydro-cushion pressure control valves. . . . . . . . . . . .

Operating Fluid High quality lubricating oil. . . . . . . . . . . . . .

Recommend Viscosity 100-250 SSU @ 100°F.. . . . . . . . .

Operating Pressure Maximum 2000 PSI. . . . . . . . . . . . . . .

Port Connections Flange, gasket or threaded. . . . . . . . . . .

Mounting Position Optional. . . . . . . . . . . . . . . . . . . . . . . . . . .

Model Port

Size Capacity

GPM Installation Drawing

RT/RCT-03-**-1*

RG/RCG-03-**-1*

RT/RCT-06-**-1*

RG/RCG-06-**-1*

RT/RCT-10-**-1*

RG/RCG-10-**-1*

RT/RCT-12-**-1*

RF/RCF-16-**-1*

Parts

Drawing “RC” Series“RC” Series

3/8 inch

3/4 inch

1 1/4 inch

1 1/2 inch

2 inch

125

I-3325-S

I-3329-S

I-3326-S

I-3330-S

I-3327-S

I-3331-S

I-3327-S

I-3328-S

I-132395

I-133101

I-132395

I-133101

I-13395

I-133101

I-132395

I-133671

I-132396

I-133103

I-132396

I-133103

I-13296

I-133103

I-132396

I-133672

Table 1. 2.

Special Application

P - Auxiliary external pilot

pressure control

Omitted standard control

3 4 5 8761 2

Valve Type 3.

Pressure control

Valve Design

C - with integral check valve

(Reverse free flow)

Omitted - Without check valve

(no reverse flow)

Installation

F - Flange connected

G -Gasket mounted

T - Threaded connections

Pressure Rating

A - 75-250 PSI (with pilot piston)

B - 125-500 PSI (with pilot piston)

D - 250-1000 PSI (with pilot piston)

F- 500-2000 PSI (with pilot piston)

Z - 25-125 PSI (without pilot piston) Design Number

Port Connections

Nominal Pipe Size

03 -3/8” female pipe thread

06 -3/4” female pipe thread

10 -1 1/4” female pipe thread

12 -1 1/2” female pipe thread

16 -2” flange female pipe thread

Circuit Application

1 - “R” Series, relief valve

(internal drain directly operated)

“RC” Series, counter balance valve

(internal drain directly operated)

2 - Sequence Valve

(external drain remotely operated)

3 - Sequence Valve

(external drain remotely operated)

4 - “R” series, unloading valve

(internal drain remotely operated)

“RC” series, counter-balance valve

(internal drain remotely operated)

Table 1. Model Code Breakdown

4Special Feature

O - Normally open spool

(decompression circuits)

Omitted - Normally closed spool

(standard)

9Design Modification

For satisfactory service life of these components, use full flow filtration to provide fluid which meets ISO cleanliness code

20/18/15 or cleaner. Selections from pressure, return, and in-line filter series are recommended.

Section II –Description

This manual contains operation, service and overhaul

information for Vickers hydro-cushion type pressure control

valves.

The “R”and the “RC”series valves are identical in operation

except the “R”series limits flow to one direction - from the

primary port to the secondary port. The “RC”series,

provided with an integral check valve, permits reverse free

flow from the secondary port to the primary port when the

valve is closed.

Since these valves can be internally or externally drained,

directly or remotely operated, they are adaptable to a wide

range of applications depending on the position of the covers

in relation to the body.

Figure 1. 6.

Type 1 Type 2 Type 3 Type 4

Drain

Plugged

Control

Port

Plugged

Remote

Control

Connection

Offset

from

Body

Passage

External Drain

Connection Drain

Plugged

Align

with

Body

Passage

Align

with

Body

Passage

Align

with

Body

Passage

Offset from

Body Passage

NOTE:

Cover positions illustrating threaded style valves apply to gasket mounted valves also, except the cover ports remain

plugged. External connecitons are made directly to the mounting surface or subplate fo the RG, RCG Series.

The four standard combinations are designated as Types 1,

2, 3, and 4. Each type is available with or without the integral

check valve, permitting reverse free flow.

TYPE 1 - is internally drained and directly operated. It is

used as a relief valve for overload protection when the sys-

tem pressure does not exceed 500 PSI. In this application

the secondary port is connected directly to tank. Or, if pro-

vided with the integral check valve, it can be used as a coun-

terbalance or brake valve.

TYPE 2 - is externally drained and directly operated. It is

used as a sequence valve permitting pressure buildup for

the second phase of a two phase cycle, while maintaining a

minimum pressure at the primary port for a holding opera-

tion, i.e., a clamp and work stroke cycle.

TYPE 3 - is externally drained and remotely operated. It is

used as a sequence valve in the same manner as Type 2

except, being remotely operated, the valve can be used to

sequence independently of the primary pressure when pro-

vided with a separate pressure source.

TYPE 4 - is internally drained and remotely operated. It is

used primarily as an unloading valve where the secondary

port must be connected directly to tank. Application of exter-

nal pressure permits the valve to open fully independent of

the primary pressure. Type 4 valves can also be used as

remotely operated counterbalance or brake valves when

provided with the integral check valve.

Section III –Installation

The RT, RCT series with threaded connections and the RF,

RCF series valves with flange connections are usually

installed directly in the supply line. Fluid flow is through the

primary pressure ports on opposite side of the valve body.

The single, secondary port, on the side of the valve adjacent

to the primary port, is connected to tank or to the secondary

circuit depending on the application and type of valve used.

The RG, RCG series gasket mounted valves are teed into

the supply line. The tee connection is piped to the bottom,

or pressure port in the subplate, or to the back surface of

the mounting area. The top, or secondary, port is piped to

tank or to the secondary circuit with the covers arranged for

internal or external drain and direct or remote control de-

pending on the valve action required.

Pilot

Piston

Adjusting Screw

Figure 2. 8.

Spring

Spool

Closed Position Open Position With Check Valve

Poppet

Spring

Section IV –Operation

Figure 2 illustrates the basic operation of the various types of

valves. The point at which the valve begins to function is

determined by the position of the adjusting screw (which

varies the force exerted by the spring on the spool) referred

to as the pressure setting of the valve. Clockwise rotation of

the screw increases pressure. Counterclockwise rotation

decreases pressure.

The effective areas of the spool exposed to hydraulic pres-

sure in primary chamber A being equal, the spool is hydrauli-

cally balanced and held in a normally closed position by the

force of the spring. When pressure is primary chamber A -

which is effective on the piston through passages C - ex-

ceeds the adjusted pressure setting, the piston is forced up-

ward moving the spool accordingly.

The spool moving upward opens secondary chamber B per-

mitting pump delivery to flow into the secondary circuit, while

maintaining a minimum pressure in primary chamber A equal

to the pressure setting of the valve.

When the primary pressure decreases, compression of the

spring overcomes the hydraulic force effective on the piston

and spool closes blocking flow to chamber B.

Fluid leakage trapped between the piston and the spool es-

capes through the center hole of the spool, into spring cham-

ber D, through drain passage E to chamber B and tank, or

externally to tank depending on the position of the top cover.

Valves with pressure ratings identified as A, B, D or F,

require the pilot piston in the bottom cover.

Valves of the Z (or low pressure rating) do not use the pilot

piston, but use a spool without the center drain hole, in order

to prevent the pilot fluid from escaping through the drain

passage.

In addition to the basic units, some models may include spe-

cial features for specific applications.

Model code breakdown on page 4, describes in detail the

valve types, pressure ranges and special applications avail-

able.

Figure 3 schematically illustrates two special feature valves.

The normally open spool is identified by the letter O in the

model number and the auxiliary remote control feature is

identified by the letter P in the model number.

Section V –Special Features

The normally open spool type, used with a special counter-

balance or decompression control requires a needle valve or

orifice installed between the primary port and the secondary

port to accomplish the decompression feature.

Operation of this valve when used with a gravity returned

single acting ram is such that pump fluid passes free flow

into secondary chamber B, then through the check valve and

chamber A into the ram. Pressure buildup in the ram closes

the spool.

When the work stroke is completed, fluid flow is diverted from

the secondary port by directing the pump delivery to tank.

On the return stroke, trapped fluid under pressure in the

primary port holds the valve spool and check valve closed

until a small amount of fluid bleeding off through the needle

valve or orifice reduces the trapped pressure.

When pressure drops below the valve setting, the spring

forces the valve spool to open directing the discharge flow

through the secondary port to tank.

DECOMPRESSION FEATURE

OPTIONAL INSTALLATIONS:

Figure 3. 11.

Secondary Port

Inlet Flow

1. A Needle Valve installed

between the Gage Ports

Primary Port

outlet to ram

or control

return flow

Normally open Spool Type “O”Auxiliary Control Type “P”

Control

Pressure

Port

2. Orifice of size required

drilled in Check Valve

Poppet to control the

rate of decompression

Valves with the “P”feature, auxiliary remote control are

available in both the R* and the RC* series.

These valves may be used to stop the movement of a

hydraulic cylinder or motor by providing hydraulic braking

when the driving force is removed.

Because of the difference in effective areas between the

bottom of the spool and the bottom of the pilot piston, the

external pilot pressure needed to open the valve to resume

movement is only one-eighth of the internal pilot pressure

required for the A, B or D rated valves and one-sixteenth of

the internal pressure required by the F rated valves.

Operation is such that the cylinder or motor is maintained in

a fixed position when force is removed until pilot pressure

applied to the large area of the spool, overcomes the spring

force. This permits the discharge fluid to pass through the

primary port into the secondary port and back to tank.

The integral check valve permits free flow from the

secondary port to the primary for reversing action of the

cylinder or motor.

Section VI –Overhaul

CAUTION

Before breaking any circuit connections, be certain

the electrical power is off and all branches of the

circuit are relieved of trapped pressure. Lower all

vertical cylinders. Discharge or isolate accumula-

tors. Block any load whose movement could cause

injury to personnel or damage to the equipment.

A. Disassembly 13.

If a valve fails to function properly, the trouble can often be

corrected without removing the valve from the installation.

This can be accomplished in the following manner.

1. Back off the adjusting screw full length to relieve all

compression on the spring.

2. Remove top cover screws, cover and spring.

3. Check the valve spool for binding or excessive

clearance in the body bore. Be sure the pilot pistons remains

in the bottom cover during the process.

4. If the spool checks out satisfactorily, remove the bottom

cover. Check the pilot piston for burrs or excessive clearance

in the cover bore.

5. Check the bottom cover for clogged control passages.

See Trouble Shooting Table 3.

For complete disassembly (See Figure 4), remove the valve

from the installation. Dismantle in the same order as the key

index numbers assigned to the exploded view.

B. Reassembly 14.

Reassemble in reverse order of disassembly. Follow key

index numbers in Figure 4 in reverse order.

NOTE

In reassembling the valves, the position of the drain

passage in the top cover in relation to the drain

passage in the body, and the position of the control

fluid passage in the bottom cover in relation to the

body passage, determines the type or function of

the valve. See Figure 1 for cover positions.

Figure 3. 15.

1. Adjusting Screw

2. Locknut

3. Cover Screw

4. Cover - Top

5. Plug - Drain Port

6. Seals or Gasket

7. Plug

8. O-Ring

9. Spring

10. Spool

11. Cover Screw

12. Cover - Bottom

13. Seals or Gasket

14. Piston

15. Plug

16. Plug

17. Body - RT Series

18. Body - RCT Series

19. Body - RG Series

20. Body - RCG Series

21. Body - RF Series

22. Body - RCF Series

23. Screw - Mtg.

24. Plate - Mtg.

25. Seal

26. Seal

27. Plug

28. Plug

29. Seal

30. Spring

31. Poppet

32. Seat

33. Neoprene Plug - Used on external

drain models only.

34. Neoprene Plug - Used on remote

control models only. 10

18 21-22

27 33

19-20

E. Troubleshooting Chart

Trouble Possible Cause Remedy

Erratic Pressure 1. Foreign matter in the system. Spool

binding in the body bore. Drain, flush and refill system with clean

fluid. Check spool for excessive wear or

burrs. Remove burrs with India Stone.

Check body bore for wear or out-of-

round. RT and RCT series, check the

connecting piping for excessive tight-

ness distorting body.

Premature Valve Action (Low Pressure) 1. Valve improperly adjusted.

2. Drain hole through main spool

plugged.

3. Main spool stuck in open position.

4. Control piston binding in up position.

Readjust valve to proper setting.

Remove spool. Blow out hole with fil-

tered compressed air.

Remove spool. Check for burrs, foreign

matter, excessive wear, out-of-round

body bore. RG and RCG series, inspect

valve mounting surfaces for flatness.

Remove bottom cover. Check piston for

burrs.

Delayed Valve Action (High Pressure) 1. Control piston binding in bottom

position.

2. Control fluid passage in bottom cov-

er plugged.

Check for burrs, foreign matter or ex-

cessive wear.

Remove cover. Clear obstruction from

control passage and blow clean with

compressed air.

Table 3. Trouble Shooting Chart

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