The Yoshitake GD-24GS is a pressure reducing valve designed for hot or cold water applications. It operates with an inlet pressure range of 0.2 to 1.6 MPa and a reduced pressure of 0.05 to 0.55 MPa, achieving a maximum pressure reducing ratio of 10:1. The GD-24GS is a complete set that includes the GD-24 pressure reducing valve, a pressure gauge, and an SY-24 strainer (with a 60-mesh screen).

INFO

The pressure gauge and strainer are included with the product and must be attached to the pressure reducing valve when installing the piping on site. The valve can be mounted horizontally or vertically.

Specifications

Model	GD-24GS
Nominal size	15~50A
Application (Fluid)	Hot or cold water
Inlet pressure	0.2~1.6 MPa
Reduced pressure	0.05~0.55 MPa
Min. differential pressure	0.05 MPa
Max. pressure reducing ratio	10:1
Temperature	5~80℃ (*)
Connection	JIS Rc
Body Material	Bronze
Valve (Disc) Material	Urethane rubber
Valve Seat Material	Stainless steel
Diaphragm Material	NBR

* Avoid continuous use at 70 ℃. The maximum temperature of the pressure gauge is 45°C. If the fluid temperature exceeds 45°C, protect the pressure gauge by using a siphon tube or similar. The accuracy of the pressure gauge is ±3.0%F.S.

Nominal Size Selection

ΔP: Inlet/reduced pressure differential (MPa) Note: The chart shown above is for a GD-24 valve without SY-24. Considering factors such 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

Characteristics

Flow Rate Characteristics Chart

Pressure Characteristics Chart

Dimensions and Maintenance Space

To ensure adequate maintenance space for disassembly, refer to the dimensions below.

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

Values are in mm. The factory-installed plug at the pressure gauge joint is only for an airtightness test. Replace it with the included pressure gauge.

Installation Piping Example

WARNING

In case installing a safety relief valve as a safety device at the outlet side, joint the relief pipe at the outlet of the safety relief valve and guide it to a safe place where fluid can relieve out. The set pressure of the safety relief valve must be higher than the set pressure of the pressure reducing valve plus 10%.

TIP

• Install the SY-24 strainer (60 mesh) at the valve inlet side.
• Install a pressure gauge at the inlet side.
• When installing quick open and close valves (such as a solenoid valve) or pressure reducing in two stages, secure at least 3 m from the valve to prevent malfunction.
• When using a product with a pressure gauge outdoors, provide a canopy to prevent rainwater from directly hitting the gauge.

Adjustment Procedure

The GD-24 pressure reducing valve is set at 0.1 MPa at the factory. Change the set pressure as appropriate.

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 the safety relief valve is not activated). Be sure to close the by-pass valve when completed.
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 and the sealed nut, and slowly turn the adjusting screw (clockwise to increase, counterclockwise to reduce) while observing the pressure gauge.
4. Slowly open the outlet stop valve to its full-open position.
5. After the adjustment, tighten the lock nut and the sealed nut.

Maintenance and Troubleshooting

WARNING

Completely discharge internal pressure from the valves, lines, and equipment, and cool the valve down before disassembly and inspection to prevent burns or injury.

Many faults in the pressure reducing valve are due to foreign materials. Check for clogged strainers (which decrease secondary pressure) and leakage from the by-pass stop valve (which increases secondary pressure) before troubleshooting the valve itself.

Consumable Parts Replacement

Service life depends on frequency and usage conditions. Replace the Diaphragm and O-rings approximately every 3 years.

Troubleshooting

Problem	Cause	Countermeasure
Reduced pressure exceeds prescribed level	1. Diaphragm is damaged. 2. Foreign matter is embedded in the valve/valve seat, or scratches exist.	1. Replace the diaphragm. 2. Disassemble and remove the foreign matter. If scratches exist, replace it.
Pressure does not rise to the desired level	1. Screen is clogged. 2. Pressure gauge malfunction.	1. Disassemble and clean. 2. Replace the pressure gauge.
Leakage	1. Loosen Bolt. 2. Loosen Cap. 3. Broken O-ring for cap.	1. Tighten Bolt. 2. Tighten Cap. 3. Replace O-ring for cap.
Abnormal noise is heard	1. The suspension metal is in incorrect position.	1. Correct the position of the suspension metal.

Exploded View

(Part names shown in boxes are consumable parts)