Yoshitake GD-26G Manuel utilisateur

■ EP D T -0 8 8 ■

MODEL GD-26G, GD-27G

Pressure Reducing Valve

PRODUCT

MANUAL

Thank you very much for choosing the Yoshitake’s product. To ensure the correct and safe use of the

product, please read this manual before use. This manual shall be kept with care for future reference.

The symbols used in this manual have the following meanings.

Warning

This symbol indicates a potentially hazardous situation that, if not avoided,

could result in death or serious injury.

Caution

This symbol indicates a hazardous situation that, if not avoided, may result in

minor or moderate injury or may result in only property damage.

Table of Contents

1. Specifications

1.1 Specifications ····················································· 1

1.2 Nominal size selection ······································ 2 - 3

1.3 Flow rate characteristics chart ································ 3

1.4 Pressure characteristics chart································· 3

2. Dimensions and weights ·········································4 - 5

3. Operation ································································ 6

4. Maintenance and inspection

4.1 Precaution for operation ········································ 7

4.2 Warning and caution for operation ··························· 8

4.3 Piping example ··················································· 8

4.4 Adjusting procedure ············································· 8

4.5 Troubleshooting ·················································· 9

4.6 Warning for disassembly and inspection ················· 10

4.7 Disassembly····················································· 10

5. Exploded view ···················································11 - 12

After Sales Service

■ EP D T-0 8 8■

. Specifications

Caution

(1) Please collate with attached nameplate and specification of ordered model.

* Please consult factory in case they do not match each other.

1.1 Specifications

Model GD-26G GD-27G

Nominal size 15 - 50A 25 - 100A

Applic

ation

Air, Other non

dangerous fluids

Inlet pressure

1.0 MPa or less

Reduced pressure

0.05

0.35 MPa

0.30

0.70 MPa

Min. differential pressure

0.05 MPa

Max. pressure reduc

tion

ratio

Application temperature 5 - 90 C

Material

Body

Bronze

Valve seat

Bronze

Valve d

isc

EPDM

Diaphragm EPDM

Connection JIS Rc screwed JIS 10K FF flanged

The products of the nominal size 15A to 50A incorporate a strainer (40 mesh).

Pressure gauge connection port is JIS R1/8.

Caution

(1) For medium including oil, use fluorine rubber for disc and diaphragm.

* If not, disc and diaphragm may be broken.

■ EP D T-0 8 8■

1.2 Nominal size selection

Nominal size selection chart

[Example]

When selecting the nominal size of a pressure reducing valve whose inlet pressure (P

), reduced

pressure (P

), and flow rate are 0.3 MPa, 0.2 MPa, and 200 m

/h (standard condition),

respectively, first find intersection point (A) of the inlet pressure (P

) of 0.3 MPa and the reduced

pressure (P

) of 0.2MPa.

Trace down vertically from the intersection point to find intersection point (B) with the flow rate of

200 m

/h (standard condition). Since intersection point (B) lies between nominal size 25A and

32A, select the larger one, 32A.

(

)

(B)

(

)

(A)

Nominal

Size

(

)

(

)

■ EP D T-0 8 8■

Nominal size selection calculation formula

[Cv value calculation formula]

Nominal size 15A

20A

25A 32A 40A 50A 65A 80A

100A

Rated Cv value 2 2.3 3.5 6 7 11 21 26 38

1.3 Flow rate characteristics chart

Offset

Pressure

range

Reduced

pressure range

Offset

A 0.05 - 0.35 MPa

0.05 MPa

or less

B 0.30 - 0.70 MPa

0.10 MPa

or less

1.4 Pressure characteristics chart

This chart shows variation in the reduced pressure when the inlet pressure of 0.60 MPa is changed

between 0.15 MPa and 1.0 MPa after the reduced pressure is set at 0.10 MPa.

Q: Max. Fluid flow rate

/h (standard condition)]

: Inlet pressure [MPa

･

: Reduced pressure [MPa

･

ΔP: P

－

[MPa]

G: Specific gravity

(Specific gravity per air)

t: Fluid temperature [

℃

]

)PP(P

t)G273(

2940

P2550

t)G273(Q

Reduced pressure (MPa)

Inlet pressure (MPa)

Shut-off pressure rise

(0.02 MPa or less)

Set pressure

Min. adjustable

flow rate

Offset

Reduced pressure

Rated flow

Flow rate

■ EP D T-0 8 8■

Dimensions and

Weights

No.

Parts name

No.

Parts name

1 Body 9 Diaphragm

Spring chamber

Strainer

3 Valve seat 11 Strainer cap

Spindle

Diaphragm shell

Retaine

Spring plate

6 O-Ring 14 Adjusting screw

Disc cover

Adjusting s

pring

8 Disc

GD-26G

(mm)

Nominal

size d L H

H Weight

(kg)

37.5

59.5

1.6

20A

Rc 3/4

38.5

59.5

1.7

25A

Rc 1

135

170

32A

Rc 1 1/4

180

224

40A Rc 1 1/2 180 57 224 4.4

50A Rc 2 200 61 239.5 6.5

■ EP D T-0 8 8■

GD-27G 25A-50A

GD-27G 65A-100A

(mm)

Nominal

size L H

H JIS 10K FF Flanged Weight

(kg)

d D C t n- h

25A 160 41 170 25 125 90 14 4-19 5.1

32A 200 57 224 32 135 100 16 4-19 7.5

40A 200 57 224 40 140 105 16 4-19 7.7

50A

220

239.5

155

120

10.

65A

220

329

175

140

20.

80A

230

345

185

150

22.0

100A

270

412

100

210

175

3.0

■ EP D T-0 8 8■

Operation

The adjusting screw [14] compresses the

adjusting spring [15], pushes down on the

diaphragm [9], and opens the disc [8] that is

directly connected to it.

The fluid that entered from the primary side

flows out from the upper part of the disk [8] to

the secondary side, and at the same time, acts

directly on the diaphragm [9] as the secondary

side pressure.

When the sluice valve on the secondary side is

closed, the pressure applied to the diaphragm

[9] increases, overcomes the load of the

adjustment spring [15], and the disc [8] closes.

Gradually opening the sluice valve on the

secondary side reduces the pressure applied to

the diaphragm [9] and opens the disc [8].

The fluid flowing out to the secondary side acts

on the diaphragm [9] as the secondary side

pressure, balances with the load of the

adjustment spring [15], adjusts the valve

opening, and keeps the secondary side

pressure constant.

■ EP D T-0 8 8■

Maintenance and inspection

4.1 Precaution for operation

Caution

1. Do not disassemble the product unless it is necessary.

* Unnecessary disassembly prevents the product from functioning properly.

2. Before installing the product in the piping, be sure to remove foreign substances and scale from

the piping.

* Ingress of foreign substances, scale or seal agent into the product leads to valve leakage or

malfunction of the product.

3. Be sure to install a strainer at the inlet side of the product of nominal size 65A to 100A.

* Ingress of foreign substances or scale into the product leads to malfunction of the product. It is

recommended to use a strainer of 40 mesh or more.

4. Install a safety relief valve for equipment protection at the outlet side of the product.

* Failure to follow this notice may result in damage of the equipment.

5. Be sure to install pressure gauges at the inlet and outlet sides of the product.

* Failure to follow this notice hampers correct pressure adjustment.

6. If a quick operating valve such as a solenoid valve is installed, place it at a distance of at least 3

meters from the product.

* Failure to follow this notice may result in malfunction or a drastically shortened service life of the

product.

7. For two-stage pressure reduction, keep a distance of at least 3 meters between each product.

* Failure to follow this notice may prevent the product from functioning properly due to malfunction.

8. Install the product properly by checking the inlet, outlet and proper posture.

* Installing the product in wrong directions prevents the product from functioning properly.

9. Install pipes so that excessive load, torque or vibration is not applied to the product.

* Failure to make durability lower or cause malfunction.

(1) The product can be installed either horizontally or vertically.

(2) A space more than the value shown as H

in the table below is required for disassembly and

inspection. A space more than the value shown as H

in the table below is required for the

inspection of the built-in strainer (nominal size 15A to 50A).

(mm)

Nominal size

20A

25A

32A

40A

50A

65A

80A

100A

250

300

320

450

550

120

150

--- ---

■ EP D T-0 8 8■

4.2 Warning and caution for operation

Warning

When the product is used for hot fluid, do not touch the product with bare hands.

* The product having hot fluid may scald your skin.

Caution

1. Before leading fluid into the product, close the stop valves at the inlet and outlet of the product and

remove foreign substances and scale from the piping completely by using a bypass line.

* Failure to follow this notice may prevent the product from functioning properly due to the ingress

of foreign substances and scale into the product.

2. To adjust the set pressure, turn the adjusting screw slowly.

* Failure to follow this notice may result in damage to the product and other equipment due to

hunting or other cause.

3. When the product is not used for an extended period, completely discharge fluid from the product

and pipes, and close the stop valves at the inlet and outlet sides of the product.

* Failure to follow this notice causes malfunction of the product due to rusting inside the product

and the pipes.

4.3 Piping example

4.4 Adjusting procedure

Following a wrong adjusting procedure may cause hunting, scale problems or other problem, and can

heavily damage the main parts of the valve. To avoid these problems, be sure to follow the procedure

given below.

1. Close the stop valves at the inlet and outlet sides of the reducing valve, and take adequate time to

blow out fluid by using a bypass line. In doing this, adjust the opening of the globe valve in the by-

pass pipe so as not to blow out the safety relief valve. After the end of blowing, close the globe

valve without fail.

2. Fully open the stop valve at the inlet side slowly, and open the stop valve at the outlet side so that

a little fluid can flow through.

3. Remove the domed cap nut and turn the adjusting screw [14] while watching the pressure gauge

at the outlet side.

Turn the adjusting screw to the right (clockwise) to increase the reduced pressure.

Turn the adjusting screw to the left (counterclockwise) to decrease the reduced pressure.

4. Fully open the stop valve at the outlet side slowly.

5. After the adjustment is complete, tighten the domed cap nut.

pass

Globe valve

Pressure gauge

Inlet side

Stop

valve GD-26GS

Stop

valve

Pressure

gauge Safety valve

Outlet side

■ EP D T-0 8 8■

4.5 Troubleshooting

Trouble

Cause

Remedy

Reduced pressure

does not reach the

desired value.

1. The working pressure is improper. 1. Correct the working pressure. (See

“

Specifications

”

2. The nominal size of the product is

too small for the flow rate for use.

2. Replace the product with the proper

nominal size.

3. Pressure adjustment is improper. 3. Readjust the pressure in

accordance

with the given procedure.

4. Strainer built in the product is

clogged.

4. Clean the strainer.

Pressure gauge is broken.

Replace pressure gauge.

Abnormal pressure

rises at the outlet

side.

Foreign substances stuck between

the disc [8] and the valve seat [3],

or scratch on them.

1. Disassemble the product and

remove the foreign substances. If

scratch is observed on the valve

dis

or valve seat, replace

2. The O-ring [6] is damaged. 2. Replace the O-ring.

The diaphragm [9]

is damaged.

Replace the diaphragm.

4. There is a leakage from the globe

valve of the by

pass line.

4. Repair or replace the globe valve.

Abnormal sound

1. The nominal size of the product is

too large for the specifications of

the system.

1. Replace the product with the proper

nominal size.

2. The pressure reduction ratio is too

large or the maximum pressure

difference is exceeded.

2. Reduce pressure in two stages.

(See “2.1 Specifications”.)

3. A quick operating valve is located

near the product.

3. Keep a distance between them as

large as possible.

Most of problems with the pressure reducing valve are caused by foreign substances and scale in

the piping. Avoid the ingress of dust and dirt to the product with caution.

A phenomenon similar to valve failure could occur due to the failure of the pressure gauge,

leakage or insufficient tightening of the globe valve in the by-pass line, clogging of the strainer,

and other causes. Check the above possible causes and take a proper remedy and preventive

measures.

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