Yoshitake GD-27S-NE is a direct-acting, internal sensing diaphragm pressure reducing valve designed for cold and hot water applications. This valve features a robust cast stainless steel body and FKM valve disc, ensuring durability and zero valve leakage. It utilizes a pressure balance structure to maintain a constant reduced pressure regardless of inlet pressure fluctuations, making it highly reliable for industrial and commercial water systems.

Features

• Wetted parts are made of corrosion-resistant material to prevent rusty water.
• JWWA approval (compliant with the Japanese Water Supply Act).
• Reduced noise during operation.
• Pressure balance structure keeps 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 simply from the upper side.
• Compact and lightweight design makes piping works easy.

Specifications

Specification	Value
Application	Cold and hot water
Inlet pressure	1.0 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°C
Body Material	Cast stainless steel
Valve seat Material	Cast stainless steel
Valve disc Material	FKM
Diaphragm Material	EPDM
Connection	JIS 10K FF flanged

INFO

The products of the nominal size 20A to 50A incorporate a strainer (40 mesh). 65A to 100A do not include a strainer. Pressure gauge connection port is JIS R1/4.

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	230	345	82	22.0
100A	270	412	94	34.5

Rated Flow Rate

The differential pressure before and after the valve is 0.15 MPa or more. If the differential pressure is less than 0.15 MPa, refer to the flow rate charts.

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

Flow Rate Chart (15A to 50A)

Installation and Operation

WARNING

• When the product is used for hot fluid, do not touch the product with bare hands.
• Before installing the product in the piping, be sure to remove foreign substances and scale from the piping.
• Be sure to install a strainer at the inlet side of the product of nominal size 65A to 100A.

Piping Example

TIP

Install a safety relief valve for equipment protection at the outlet side of the product. Be sure to install pressure gauges at the inlet and outlet sides of the product for correct pressure adjustment.

Structure and Parts

Key components include the cast stainless steel body, FKM valve disc, EPDM diaphragm, and a pressure balance structure regulated by an alloy steel adjusting spring.