Yoshitake GD-29S is a direct-acting pressure reducing valve designed for cold and hot water applications. Featuring a cast stainless steel body and EPDM diaphragm and valve disc, it provides excellent corrosion resistance and durability. The GD-29S supports inlet pressures up to 1.6 MPa and offers a maximum pressure reduction ratio of 10:1, making it highly reliable for stable pressure control.

INFO

The GD-29S is connected via JIS 16K FF flanged ends. A built-in strainer (40 mesh) is incorporated in sizes 20A to 50A, while sizes 65A to 100A do not include a strainer.

Features

• Wetted parts are made of corrosion-resistant material to prevent rusty water.
• Reduced noise operation.
• Pressure balance structure keeps the reduced pressure at a constant level without being affected by inlet pressure fluctuations.
• Closed structure keeps fluid inside even if the diaphragm is damaged or broken.
• Maintenance and inspection can be conducted easily by disassembling simply from the upper side.
• Compact and lightweight design makes piping works easy.

Specifications

Specification	Value
Application	Cold and hot water
Inlet pressure	1.6 MPa or less
Reduced pressure	(A) 0.05-0.35 MPa (B) 0.3-0.7 MPa
Minimum differential pressure	0.05 MPa
Maximum pressure reduction ratio	10:1
Application temperature	5-90℃
Body material	Cast stainless steel
Valve seat material	Cast stainless steel
Valve disc material	EPDM
Diaphragm material	EPDM
Connection	JIS 16K FF flanged

Dimensions and Weights

Nominal size	L (mm)	H (mm)	H1 (mm)	Weight (kg)
20A	160	170	41	3.9
25A	160	170	41	4.8
32A	200	224	57	8.0
40A	200	224	57	8.3
50A	220	239.5	61	10.8
65A	220	329	77	20.6
80A	234	345	82	25.0
100A	278	412	94	36.5

Rated Flow Rate

(The differential pressure before and after the valve is 0.15 MPa or more.)

Nominal size	20A	25A	32A	40A	50A	65A	80A	100A
Rated flow (L/min)	40	60	100	150	250	300	450	700

If the differential pressure before and after the valve is less than 0.15 MPa, select a proper nominal size from the charts below.

Flow Rate Charts

Nominal size: 20A to 50A

Nominal size: 65A to 100A

Performance Characteristics

Pressure Characteristic Chart This chart shows variation in reduced pressure when the inlet pressure of 0.6 MPa is changed between 0.15 MPa and 1.0 MPa while the reduced pressure is set at 0.1 MPa.

Flow Characteristic Chart

Offset Pressure

Nominal size	Pressure range	Reduced pressure range	Offset pressure
20A-100A	A	0.05-0.35 MPa	Within 0.05 MPa
20A-100A	B	0.30-0.70 MPa	Within 0.10 MPa