Yoshitake GD-29-NE is a pressure reducing valve designed for cold and hot water applications. It operates with an inlet pressure of up to 1.6 MPa and features a cast bronze body with a pressure balance structure to keep reduced pressure constant.

Features

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

Specifications

Specification	Value
Nominal Size	25A-100A
Application	Cold and hot water
Inlet Pressure	1.6 MPa or less
Reduced Pressure	(A) 0.05-0.35 MPa (B) 0.30-0.70 MPa
Minimum Differential Pressure	0.05 MPa
Maximum Pressure Reduction Ratio	10:1
Maximum Temperature	90°C
Body	Cast bronze (NPb-treated)
Valve Seat	Cast bronze (NPb-treated)
Valve Disc	FKM
Diaphragm	EPDM
Connection	JIS 16K FF flanged

INFO

• A strainer (40 mesh) is incorporated in 15A to 50A. 65A to 100A do not include strainer.
• Pressure gauge connection port is JIS Rc 1/8.

Dimensions and Weight

Nominal Size	L	H	H1	Weight (kg)
25A	160	170	41	5.1
32A	200	224	57	7.5
40A	200	224	57	7.7
50A	220	239.5	61	10.9
65A	220	329	77	20.0
80A	234	345	82	24.0
100A	278	412	94	36.5

Details

Note: Values specific to the 80A and 100A GD-29-NE are extracted from the source dimensions table parentheses.

Rated Flow Rate

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

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

(2) If the differential pressure before and after the valve is less than 0.15 MPa, select a proper nominal size from the appropriate chart shown below.

Flow Rate Charts

Nominal size: 15A to 50A

Nominal size: 65A to 100A

Noise Characteristic Chart

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
25A-100A	A	0.05-0.35 MPa	Within 0.05 MPa
25A-100A	B	0.30-0.70 MPa	Within 0.10 MPa

Installation and Operation

WARNING

• Completely discharge the pressure inside of the product, piping and equipment before disassembly and inspection.
• When the product is used for hot fluid, do not touch the product with bare hands. The product having hot fluid may scald your skin.

Precaution for installation

1. Before installing the product in the piping, be sure to remove foreign substances and scale from the piping.
2. Be sure to install a strainer at the inlet side of the product of nominal size 65A to 100A.
3. Install a safety relief valve for equipment protection at the outlet side of the product.
4. Be sure to install pressure gauges at the inlet and outlet sides of the product.
5. The product can be installed either horizontally or vertically.