Yoshitake GD-46KK home water supply pressure reducing valve (GD-46 Series) enables shorter construction work periods since water pressure inspection can be performed easily by turning the cap upside down with the valve installed. It is typically installed on the water supply line to each household of a complex housing to ensure that water is supplied at a regulated pressure.

Features

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

Specifications

Nominal size	20A
Application	City water
Inlet pressure	1.0 MPa or less
Reduced pressure	(A) 0.05-0.10 MPa [Standard setting: 0.09 MPa] (B) 0.10-0.22 MPa [Standard setting: 0.20 MPa] (C) 0.20-0.30 MPa [Standard setting: 0.25 MPa]
Minimum differential pressure	0.02 MPa
Maximum pressure reduction ratio	10:1
Minimum adjustable flow rate	0.5 L/min
Rated flow rate (Without check valve)	50 L/min (Differential pressure before and after valve: 0.10 MPa or more)
Rated flow rate (Equipped with check valve)	30 L/min (Differential pressure before and after valve: 0.10 MPa or more)
Body Material	Cast bronze (NPb-treated)
Spindle Material	Dezincification resistant material
Valve disc / Diaphragm	Synthetic rubber/Stainless Steel / Synthetic rubber
Pressure check function	Pressure gauge joint (JIS Rc1/8)

• Available with pressure gauge (type A or type D) as an optional extra (for 0.5 MPa).
• The accuracy of a pressure gauge is ±3% F.S.
• The strainer is 60 mesh.
• The product is set to the pressure reducing valve function when it is delivered from the factory.
• An incombustible material is used for heat insulating material.
• Stop valve is not made with dezincification resistant material.

Dimensions of the Heat Insulating Material

GD-46SP

GD-46PP

INFO

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.

TIP

Use a keystone tip screwdriver of 4.5 to 6 mm in nominal width for slotted head screws. Set the screwdriver in the slot of the adjusting screw avoiding the cap nut attached in the center of the screw, and adjust the reduced pressure.

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.

Dimensions and Weights

Model	Connection (Inlet x outlet)	L (mm)	Weight (kg)
GD-46	G 1 x G 1	-	1.0
GD-46PP, 46PPC	R 3/4 x R 3/4	218	1.4
GD-46KK, 46KKC, 46LL, 46LLC	Rc 3/4 x Rc 3/4	214	1.5
GD-46PK, 46PKC, 46PL, 46PLC	R 3/4 x Rc 3/4	216	1.4
GD-46KP, 46KPC, 46LP, 46LPC	Rc 3/4 x R 3/4	216	1.4
GD-46PG	R 3/4 x G 1-3/4	165	1.2
GD-46GP, 46GPC	G 1 x R 3/4	165	1.2
GD-46KG, 46LG	Rc 3/4 x G 1	163	1.2
GD-46GK, 46GKC, 46GL, 46GLC	G 1 x Rc 3/4	163	1.2
GD-46SG	Rc 3/4 x G 1	194.5	1.4
GD-46SP, 46SPC	Rc 3/4 x R 3/4	247.5	1.6

[GD-46 Series]

[Equipped with stop valve]