Yoshitake GD-46 Series water pressure reducing valve enables to shorten a construction work period since water pressure inspection can be performed easily by turning the cap upside down with the valve installed.

Features

1. Reduced noise. Can be used even late at night.
2. Water pressure inspection can be performed easily by turning the cap upside down with the valve installed.
3. Pressure balance structure can keep the reduced pressure at a constant level without being affected by inlet pressure.
4. Attached pressure gauge joint allows a pressure gauge to be installed while water is supplied so that the set pressure can be checked easily.
5. Noise characteristics and flow characteristics conform to the "Quality Criterion on Materials" of Urban Renaissance Agency in Japan.

Specifications

Specification	Value
Nominal size	20A
Application	City water
Inlet pressure	1.0 MPa or less
Reduced pressure	(A) 0.05-0.10 MPa, (B) 0.10-0.22 MPa, (C) 0.20-0.30 MPa
Minimum differential pressure	0.02 MPa
Maximum pressure reduction ratio	10:1
Working temperature	5-90°C (w/o core), 5-40°C (w/ core), 5-60°C (w/ check valve)
Minimum adjustable flow rate	0.5 L/min

INFO

The accuracy of an optional pressure gauge is ±3% F.S. The strainer is 60 mesh. An incombustible material is used for heat insulating material.

Dimensions of the Heat Insulating Material

GD-46SP

GD-46PP

Note: The heat insulating material is common to all GD-46 Series valves. However, no heat insulating material is used for the water stop valve.

Characteristic Charts

Flow Characteristic Chart

Noise Characteristic Chart

Pressure Characteristic Chart This chart shows variation in reduced pressure when the inlet pressure of 0.5 MPa is changed between 0.22 MPa and 1.0 MPa while the reduced pressure is set at 0.2 MPa.

How to Adjust the Pressure

Fig. 1

Fig. 2

1. Screw the pressure gauge into the pressure gauge joint (Fig. 1).
2. Remove the cap. By checking the pressure gauge, turn the adjusting screw to adjust the reduce pressure to a desired level (Fig.2).
   • The reduced pressure increases when the adjusting screw is turned clockwise.
   • The reduced pressure decreases when the adjusting screw is turned counterclockwise.
3. After reduced pressure adjustment, attach the cap with the flat face up.
4. Remove the pressure gauge.

Troubleshooting

Problem	Possible cause	Corrective action
Low flow rate.	• Strainer is clogged. • Setting pressure is low.	Clean the strainer. Adjust the pressure by following the adjusting steps.
Secondary pressure is higher than the set pressure.	• The cap is left in water pressure test status.	Flat surface part of cap should be upside.
External leakage.	• Set screw, valve cap, strainer cap is loose. • O ring or gasket is damaged. • Joint of pressure gauge is loosen.	Retighten the round head screw, valve cap, and the strainer cap. Replace the O ring and gasket with a new one. Remove the joint. Apply seal tape to the thread and attach the joint to the valve body.