Yoshitake GD-4R is a primary pressure regulating valve, pressure sustaining valve, and differential pressure regulating valve. It is designed as a direct pilot-type diaphragm valve for slight pressure control, featuring internal or external sensing options. It acts as a safety apparatus for adjusting slight pressure air and gases and is suitable for industrial plant applications.

Features

1. Used as a safety apparatus for adjusting slight pressure air and gases. Able to use at industrial plant.
2. Diaphragm with a large pressure sensing area has high accuracy to set pressure.
3. No leakage to outside since there is no gland part.

Specifications

Application	Air, Other non-dangerous fluids
Nominal size	20-50A, 65-150A
Fluid Temperature	5-80°C
Valve seat leakage	0.1% or less (20-50A) / 0.5% or less (65-150A) of rated flow rate
Body	Cast iron
Valve	Stainless steel
Valve seat, Spindle	Stainless steel
Diaphragm	NBR
Connection	JIS 10K FF flanged

Pressure Regulating Range (kPa) by Diaphragm Diameter

• 20-50A:
  • Φ400: 2-5, 5-10
  • Φ340: 10-25, 25-50
  • Φ256: 50-100, 100-200
• 65-150A:
  • Φ400: 2-4, 4-6
  • Φ340: 10-20, 20-50
  • Φ256: 50-100, 100-200

Dimensions (mm) and Weights (kg)

Nominal size	L	Ha	Hb	H1	Weight
20A	170	565	580	90	27
25A	170	565	580	90	28
32A	180	585	600	100	28
40A	180	585	600	100	29
50A	180	595	610	105	31
65A	215	700	715	125	39
80A	260	715	730	130	48
100A	300	785	800	160	64
125A	360	840	855	190	88
150A	382	895	910	220	123

Notes

• Dimension H will be different depends on diaphragm diameter. (Ha: φ256, Hb: φ340, φ400)
• The value of product weights are when diaphragm diameter is φ256. Please add 5 kg for φ340, and 9 kg for φ400.

Sectional drawing of valve part for nominal size 65A to 150A. Structure will be different depends on nominal size and diaphragm diameter.

Flow Characteristic Chart

Nominal Size Selection Chart (For Air)