Yoshitake GD-24GS Manuel utilisateur

■EPDT-175d■

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

could result in death or serious injury

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

in minor or moderate injury (“Caution” may also be used to indicate other

unsafe practices or risks of property damage )

Model GD-24GS

Pressure Reducing Valve

Installation & Operation Manual

Please read this manual thoroughly before using the pressure reducing valve, so that

you may do so correctly and safely

Please carefully store this manual in a handy place

－－－－－The following safety symbols are used in this manual －－－－－

Warning

Caution

Contents

1 Specifications ································································ 1

2 Dimensions and Construction

2 1 Dimensions and Weight ················································· 2~3

2 2 Construction ·································································· 4

3 Operation ··········································································· 4

4 Nominal Size Selection

4 1 Nominal Size Selection Chart ············································ 5

4 2 Flow Rate Characteristics Chart ········································ 6

4 3 Pressure Characteristics Chart ·········································· 6

5 Installation

5 1 Piping Example ······························································ 7

5 2 Warning and precaution on installation ························ 7~8

6 Operating Procedure

6 1 Warning and precaution on operation ································· 8

6 2 Adjustment Procedure ···················································· 8

7 Maintenance Procedure ························································· 9

7 1 Warning and precaution on maintenance and inspection ···· 9

7 2 Troubleshooting ···························································· 10

8 Exploded Drawing ······························································ 10

After Sales Service

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■EPDT-175d■

GD-24GS pressure reducing valve for water (Hereinafter so called pressure reducing valve) is an

all-purpose valve suitable for various applications, such as water supply systems of general

residential housing, high-rise buildings, industrial plants, and factory equipment It can also be used

to provide stable water pressure in high-rise apartment units, and for hilly areas where each house

requires an individual water supply system High durability is achieved through the use of a

stainless steel valve seat and a suspension type clamp in the drive mechanism

1 Specifications

Model GD-24GS

Nominal size 15～50A

Application (Fluid) Hot or cold water

Inlet pressure 0 2～1 6MPa

Reduced pressure 0 05～0 55MPa

Min differential pressure 0 05MPa

Max pressure reducing ratio 10: 1

Temperature 5～80℃ (*)

Material

Body Bronze

Valve (Disc) Urethane rubber

Valve Seat Stainless steel

Diaphragm NBR

Connection JIS Rc

*GD-24GS is a set of pressure reducing valve (GD-24), pressure gauge, and strainer (SY-24)

*The pressure gauge and strainer are included with the product, so attach them to the pressure

reducing valve when installing the piping on site

*The Screen of strainer is 60 mesh (standard mesh)

*The Pressure gauge connection size is R 1/8

*The accuracy of the pressure gauge is ±3 0%F S

*The valve can be mounted in horizontally and vertically

(*) Avoid continuous use at 70 ℃

Caution

Please collate with attached label or plate and specification of ordered model

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

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■EPDT-175d■

2 Dimensions & Construction

2 1 Dimensions & Weight

【GD-24GS】

(mm)

Nominal

size d L H H1 Weight

(kg)

15A Rc 1/2 150 197 5 46 2 1

20A Rc 3/4 169 216 51 2 8

25A Rc 1 193 243 63 3 9

32A Rc 1 1/4 236 285 80 5 7

40A Rc 1 1/2 286 343 90 9 7

50A Rc 2 343 404 112 17 5

【GD-24】

(mm)

Nominal

size d L H H1 Weight

(kg)

15A Rc 1/2 80 193 41 5 1 8

20A Rc 3/4 90 210 45 2 4

25A Rc 1 100 230 50 3 3

32A Rc 1 1/4 120 265 60 4 7

40A Rc 1 1/2 150 315 62 8 2

50A Rc 2 185 365 73 14 3

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■EPDT-175d■

【Pressure gauge】

【SY-24】

(mm)

Nominal

size d d1 L H1 Screen Weight

(kg)

ds ls

15A Rc 1/2 R 1/2 80 46 18 32 0 25

20A Rc 3/4 R 3/4 90 51 20 35 0 35

25A Rc 1 R 1 105 63 25 50 0 55

32A Rc 1 1/4 R 1 1/4 130 80 32 60 1 00

40A Rc 1 1/2 R 1 1/2 150 90 40 70 1 44

50A Rc 2 R 2 175 112 50 85 2 90

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■EPDT-175d■

2 2 Construction

Name of parts

1 Body (GD-24)

2 Spring Chamber

3 Cap

4 Valve (Disc)

5 Valve Seat

6 Suspension Metal

7 Diaphragm Shell

8 Diaphragm

9 Spring Plate

Adjusting Screw

Lock Nut

Spring Lock Washer

Nut

Adjusting Spring

O-ring

Bolt

Sealed Nut

Spring

Pressure Gauge

Body (SY-24)

Cap

Screen

O-ring

Label

Spring Washer

Caution

Be sure to remove the plug of the pressure gauge mounting part that was installed at the time

of shipment and replace it with the included pressure gauge

Corrosion resistance is not considered because the plug is for airtightness test at the time of

shipment

3 Operation

(Refer to the parts number in “2 2 Construction”)

Turning the adjusting screw (10) to compress the adjusting spring (14) and the load of adjusting

spring is introduced to the diaphragm (8) and suspension metal (6) to open the valve (4) Then,

the fluids begin to flow from the inlet side through the upper side of the valve The reduced

pressure is led to the diaphragm to be balanced with the adjusting spring load, and control the

valve travel to maintain the reduced pressure

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■EPDT-175d■

4 Nominal Size Selection

4 1 Nominal Size Selection Chart (For Water)

Note: *The Chart shown above is for a GD-24 valve without SY-24

*Considering such factors as noise and durability, a 2 m/s flow velocity

within the pipe is ideal

●Cv Value

Nominal size 15A 20A 25A 32A 40A 50A

Cv value 1 5 1 9 3 4 7 10

●Calculation formula for Cv value

∆

=365.0

P1 : Inlet pressure [MPa･A] V : Rated flow rate [m3/h]

P2 : Reduced pressure [MPa･A] G : Specific gravity relative to water

ΔP : P1－P2 [MPa] Cv : Cv value of the nominal size

ΔP: Inlet/reduced pressure differential (MPa)

V: Flow rate (m

/h)

Nominal size

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■EPDT-175d■

4 2 Flow Rate Characteristics Chart

4 3 Pressure Characteristics Chart

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■EPDT-175d■

5 Installation

5 1 Piping Example

5 2 Warning and precaution on installation

Warning

In case installing safety relief valve as safety device at outlet side, joint relief pipe at outlet of

safety relief valve and guide it to safety place where steam can relief out

Caution

( 1 ) Do not disassemble the valve unreasonably

*Disassembling the valve at your discretion may affect the original performance

( 2 ) Remove foreign matter and scales from the lines before installing the valve

*Failure to do so may prevent the valve from functioning correctly

( 3 ) Install a SY-24 strainer (Screen: 60 mesh) at the valve inlet side

*Failure to do so may hamper correct pressure control, which affects the original

performance

( 4 ) Install a safety relief valve at the valve outlet side for protection of equipments

*Failure to do so prevents problem detection, resulting in equipment damage

( 5 ) Install a pressure gauge at the inlet side of the valve

*Failure to do so may hamper correct pressure adjustment

( 6 ) When installing quick open and close valves, such as a solenoid valve, secure at least 3 m

from the valve

*Failure to do so may result in malfunction or drastically shortened service life

( 7 ) When pressure reducing in two stages, secure at least 3 m between the valves

*Failure to do so may result in malfunction, affecting the original performance

( 8 ) Install the valve in proper direction of the fluid flow

*Failure to do so affect the performance

( 9 ) Do not apply excessive load, torque or vibration to the valve

*Doing so may result in malfunction or drastically shortened service life

(

) Secure the necessary maintenance space at the installation site of the pressure reducing

valve (See Fig 1)

*In case there is not enough space for maintenance, pressure reducing valve cannot be

disassembled at the time of maintenance

(

)

The set pressure of safety relief valve must be higher than the set pressure of pressure

reducing valve

*In case reseating pressure of safety relief valve is lower than the set pressure of

pressure reducing valve, safety relief valve will continue to blow

(

)

Do not freeze pressure reducing valve

*Freezing may damage pressure reducing valve

(

)

Do not allow pipe adhesive materials to leak into pressure reducing valve

*In case the adhesive material is acquired in pressure reducing valve, it causes

malfunction

(14) Replace the factory-

installed plug at the pressure gauge joint with the pressure gauge

enclosed in the package

*The factory-installed plug is only for an airtightness test and it is not resistant to corrosion

-8-

■EPDT-175d■

Nominal

size A B C

15A 245

105 120

20A 270

110 125

25A 290

135 135

32A 340

160 140

40A 420

175 160

50A 480

215 170

Fig 1

6 Operating Procedure

6 1 Warning and precaution on operation

Warning

( 1 ) Do not touch directly to pressure reducing valve with bare hands after flowing hot fluids

*Doing so may result in burns

( 2 ) Before flow the hot fluids in the pipe line, make sure that the fluids will not cause the

risks through the end of piping system and the pipes are connected tightly

*In case hot fluids blows out, it may result in burns

Caution

( 1 ) When opening the by-pass stop valve, ensure that the reduced pressure will not exceed

set pressure of safety relief valve

*In case reduced pressure exceeds set pressure of safety relief valve, the safety relief

valve operates and blows out the fluids

( 2 ) When operation is discontinued for a long period of time, completely purge fluid from

pressure reducing valve and piping system, and close the stop valve located up stream

and down stream of pressure reducing valve

*Water scales developed in the piping may cause erratic operation of pressure reducing

valve

6 2 Adjustment Procedure

GD-24 pressure reducing valve is set at 0 1MPa at the factory Change the set pressure as

appropriate Wrong or poor adjustment may cause hunting, scale buildup or water hammer, or

severely damage relevant parts Be sure to follow the following steps to complete proper

adjustment (Refer to the parts number in “2 2 Construction”)

1) Close the stop valves at both sides of the pressure reducing valve, and thoroughly purge the

system through the by-pass line, with the by-pass valve opening adjusted so that the safety

relief valve is not activated When completed, be sure to close the by-pass valve

2) Slowly open the inlet stop valve, then open the outlet stop valve slightly, allowing a trickle

to be discharged

3) Loosen the lock nut (11) and the sealed nut (17), and slowly turn the adjusting screw (10)

(clockwise to increase, counterclockwise to reduce) while observing the pressure gauge (19) on

the body (1)

4) Slowly open the outlet stop valve to its full-open position

5) After the adjustment, tighten the lock nut (11) and the sealed nut (17)

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■EPDT-175d■

7 Maintenance Procedure

Be aware of foreign materials because many of faults on pressure reducing valve are due to the

existence of foreign materials Please be reminded that our warranty does not cover damages

caused by foreign materials at the customer site Failure resulting from faulty pressure gauge,

clogged strainer and leakage from by-pass stop valve are phenomena kindred to failure of pressure

reducing valve Clogged strainer will decrease the secondary pressure and leakage from by-pass

pipe will increase the secondary pressure Before do the troubleshooting of pressure reducing valve,

check such symptom of the strainer and stop valve

7 1 Warning and precaution on maintenance and inspection

Warning

The pressure reducing valve shall be disassembled and inspected by qualified persons

( 1 ) Completely discharge internal pressure from the valves, lines, and equipment, and cool

the valve down to a level where you can touch it with bare hands before disassembly and

inspection

*Failure to do so may result in injury or burns due to residual pressure or spillage

around the valve

Caution

( 1 ) To maintain the functions and performance of pressure reducing valve, perform

periodical inspection

*User should request to specialized dealer or manufacturer for such tasks

( 2 ) Pressure reducing valve should be disassembled and inspected by qualified person or

manufacturer

*Request the treatment to specialized dealer or manufacturer in case of any problems

( 3 ) During disassembling, internal fluid flows out Discharge it into a suitable container

Disassembling pressure reducing valve after all fluids have been discharged

*Fluid spills will contaminate surroundings

( 4 ) Close the stop valves before and after pressure reducing valve, and remove all foreign

matter and scales via the by-pass line before operation

*Failure to do so may cause the malfunction of pressure reducing valve

･Consumable parts and replacement period

Service life of consumable parts is dependent on the frequency and condition of usage Rough

indication of service life is given below

(Refer to the parts number in “2 2 Construction”)

Name of parts No Replacement period

Diaphragm (8) 3 years

O-ring (15)・(23) 3 years

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