Yoshitake GP-1000HEN is a pilot-operated pressure reducing valve designed for steam applications. It features a ductile cast iron body and stainless steel internals, offering precise control over pressure fluctuations and flow rate changes.

Features

1. The GP-1000HEN is an easy replacement for existing valves because it complies with face-to-face dimensions of the EN standard (except for 15A).
2. The valve responds very sharply to the fluctuation of inlet pressure and the change of the flow rate, so that the reduced pressure can be kept at a constant level.
3. Pressure adjustment is easy, and the set pressure range is wide.
4. Compliant with the standard of SHASE-S106 Pressure Reducing Valves (by the Society of Heating, Air-Conditioning and Sanitary Engineers of Japan).

Specifications

Model	GP-1000HEN / GP-1000H
Application	Steam
Inlet pressure	0.1-1.6 MPa
Reduced pressure	(A) 0.05-0.9 MPa (B) 0.9-1.4 MPa 90% or less of inlet pressure (gauge pressure)
Minimum differential pressure	0.05 MPa
Maximum pressure reduction ratio	20:1
Maximum temperature	220°C
Valve seat leakage	0.01% or less of rated flow rate
Material: Body	Ductile cast iron
Material: Main valve, valve seat	Stainless steel
Material: Pilot valve, pilot valve seat	Stainless steel
Material: Piston, cylinder	Stainless steel
Material: Diaphragm	Stainless steel
Connection	EN PN25 flanged

INFO

• Available with JIS Rc screwed (GP-1010H).
• For 15A, 20A, ASME flange is not available.

Dimensions and Weights

Nominal size	L (GP-1000HEN)	L (GP-1000H)	H (GP-1000HEN)	H (GP-1000H)	H1	Weight (GP-1000HEN)	Weight (GP-1000H)
15A	150	150(-)	291	285	64	8.0	8.0(-)
20A	150	155(-)	291	285	64	8.5	8.5(-)
25A	160	160 (160)	300	300	67	10.0	10.0 (10.0)
32A	180	190 (180)	333	323	82	14.0	14.0 (14.0)
40A	200	190 (200)	333	323	82	15.5	14.5 (15.5)
50A	230	220 (230)	353	347	93	21.0	20.0 (21.0)

INFO

The values in parentheses are the dimensions of ASME Class 300 flanged.

Specifications Selection Chart

Find the intersection point of the inlet and reduced pressures. If the intersection point is within range (A) in the chart, the pressures are controllable with a single pressure reducing valve. They can be controlled by two-stage pressure reduction if the intersection point is within range (B). The valve does not fulfill specified performance in range (C).

Characteristic Charts

Pressure Characteristic Chart

This chart shows variation in reduced pressure when the inlet pressure of 1.0 MPa is changed between 0.3 MPa and 1.6 MPa while the reduced pressure is set at 0.1 MPa.

Flow Characteristic Chart

• Shut-off pressure rise: Within 0.02 MPa
• Offset pressure: Within 0.03 MPa (when the set pressure is between 0.05 MPa and 0.1 MPa); Within 0.05 MPa (when the set pressure is more than 0.1 MPa and 1.4 MPa or less)

Table of Corrected Cv Values

Table of rated Cv values (Cv value when the correction factor C = 1)

Nominal size	15A	20A	25A	32A	40A	50A	65A	80A	100A
Cv values	1	2.3	4	6.5	9	16	25	36	64

Note

When the reduced pressure is within either of the ranges shown below, calculate the corrected Cv value by multiplying the rated Cv value by the correction factor C obtained from Fig. 1.

• When the inlet pressure is between 0.7 MPa and 1.0 MPa and the pressure reduction ratio is more than 10:1
• When the inlet pressure is more than 1.0 MPa and the reduced pressure is 0.4 MPa or less

Fig. 1: Corrected Cv value

Nominal Sizes Selection Chart (For Steam)

When selecting the nominal diameter of a pressure reducing valve with an inlet pressure (P1) of 0.8 MPa, reduced pressure (P2) of 0.05 MPa, and steam flow rate of 600 kg/h, first find the intersection point (C) of the inlet pressure 0.8 MPa and the diagonal line. Then, move left from this point to find the intersection point (D) with the reduced pressure of 0.05 MPa. From point (D), move vertically downward to find the intersection point (E) with the flow rate of 600 kg/h. Since point (E) lies between the nominal diameters 32A and 40A, select the larger diameter, 40A.

TIP

Set the safety factor at 80 to 90%.