Yoshitake GD-43N-10 is a direct-acting pressure reducing valve designed for cold and hot water, as well as steam for washing or sterilization. Featuring a closed structure and a pressure balance mechanism, it maintains a constant reduced pressure without being affected by fluctuations in the inlet pressure.

The wetted parts of the valve are constructed from stainless steel (SCS14A and SUS316) to improve corrosion resistance. The diaphragm's contact surface with the fluid is covered with PTFE, making it highly durable and less prone to deterioration.

Features

• Space and Resource Saving: Materials are indicated on the body and lower cap for easy resource recycling.
• High Corrosion Resistance: Wetted parts utilize stainless steel, and special fluorine-contained rubber parts (FKM) are highly resistant to corrosion.
• Durable Diaphragm: Heat-resistant synthetic rubber covered with PTFE.
• Pressure Balance Structure: Ensures reduced pressure remains constant regardless of inlet pressure changes.
• Closed Structure: Prevents fluid from leaking to the outside.
• JWWA Approved: Meets the standards of the Japan Water Works Association.
• Versatile Applications: Suitable for piping washing, system washing, sterilization washing, and steam for sterilization.

Specifications

Specification	Value
Application Fluid	Cold and hot water, Steam for washing or sterilization
Inlet Pressure	0.07–1.0 MPa (Max 0.2 MPa for washing/sterilization steam)
Reduced Pressure Ranges	Spring A (Yellow): 0.02–0.1 MPa Spring B (Red): 0.1–0.25 MPa Spring C (Black): 0.25–0.5 MPa
Minimum Differential Pressure	0.05 MPa
Maximum Pressure Reduction Ratio	10:1 (for cold/hot water)
Fluid Temperature	5–90°C (Max 130°C for sterilization steam; 4-hour interval between blows)
Body Material	Cast Stainless Steel (SCS14A)
Valve Disc Material	Special Synthetic Rubber (Special FKM)
Connection	JIS 10K FF Flanged

WARNING

When using the pressure reducing valve for a steam passage, the maximum temperature limit must be 130°C and the maximum primary pressure limit must be 0.2 MPa. Operation outside these limits will cause damage. Allow an interval of at least four hours between steam flows.

Dimensions and Weights

Dimensions for JIS 10K FF Flange

Size	D (mm)	C (mm)	t (mm)	n-h (mm)	Weight (kg)
15A	95	70	12	4-15	2.6
20A	100	75	14	4-15	2.9
25A	125	90	14	4-19	3.7

Design and Components

Key components include a cast stainless steel (SCS14A) body, a stainless steel (SUS304) valve spring, an FKM & PTFE diaphragm, and an FKM O-ring.

Sizing Selection (Cold and Hot Water)

INFO

To select the nominal size, find the intersection of the differential pressure and the required flow rate. If the intersection falls between two sizes, always select the larger nominal size.

Installation Example

TIP

• Be sure to install a strainer (60 mesh or more) at the inlet side of the valve.
• Horizontal or vertical installation is possible.
• Install a safety valve at the outlet side to protect downstream equipment.
• When installing a quick opening/closing device (e.g., solenoid valve), the distance from the pressure reducing valve must be at least 3 m.