Fushiman D260 type differential pressure valve for steam

Manufacturer: Fushiman Co.,LTD.
Model: D260

Model	Nominal diameter	Primary pressure measurement	Differential pressure setting range	Maximum operating temperature	Body Material	Connection
D260	15–80	Max. 1.0 MPa	0.03 to 0.8 MPa	220°C	FC, FCD	Flanges

The D260 differential pressure valve is used in boiler combustion lines, etc.
The primary valve is the P260 pressure reducing valve. For detailed specifications of the primary valve, please refer to the P260 pressure reducing valve (page 6 and beyond).
Specifications and Performance

Item	Specification
Nominal Diameter	15–80
Main Valve Fluid	Steam
Detecting Fluid	Gas, Non-Corrosive Liquid
Primary Side	Maximum Pressure P₁: 1.0 MPa
Primary Side	Maximum Temperature: 220°C
Secondary Side P₂	0.03–0.9 MPa
Detecting Pressure P₃	1.0 MPa or lower
Differential Pressure Setting Range (ΔP = P₂ – P₃)	0.03–0.2 MPa, 0.1–0.8 MPa
Cv Value	4.5d² → 3.1d²
Minimum Pressure Reduction Ratio	10% of Primary Side Pressure (Min. 0.07 MPa)
Offset	0.03 MPa or lower
Hysteresis	0.02 MPa or lower
Minimum Adjustable Flow Rate	5% of Rated Flow
Valve Leakage Rate	0.05% or lower of Rated Flow
Valve Body Material	Cast Iron
Main Valve & Main Valve Seat	Stainless Steel
Piston & Cylinder	Stainless Steel
Diaphragm	Stainless Steel
Spring Guard	Bronze
Main Valve & Strainer Connection	Flange Type, JIS 10K Full Face

Notes:

The main valve performance values are based on a detected pressure P₃ of 0 kPa (atmospheric pressure).
The Cv value is the same as that of the P260 pressure reducing valve (see page 7 for reference).
Offset, shut-off pressure rise, and minimum adjustable flow rate are reference values (target values).
For nominal diameters 15 to 40, the valve body is made of spheroidal graphite cast iron.

Structure and Dimensions

D260

Dimensions

Nominal Diameter (mm)	L (mm)	H₁ (mm)	H₂ (mm)	K (mm)	Weight (kg)
15	145	78	175	130	8
20	150	73	180	130	8.5
25	160	71	182	130	10
32	175	77	193	131	12
40	190	85	203	126	14
50	210	95	217	126	18
65	235	111	236	126	26
80	265	123	253	126	32

Installation Example

The nominal diameter selection for the D260 differential pressure valve, piping examples, and alarm safety valve nominal diameter selection are the same as those for the P260 pressure reducing valve (pages 7 and 9). Please refer to them.

Fushiman Co.

Specifications and Performance

Structure and Dimensions

Dimensions

Installation Example

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Weight Calculation

Nominal Diameter (mm)	L (mm)	H₁ (mm)	H₂ (mm)	K (mm)	Weight (kg)
15	145	78	175	130	8
20	150	73	180	130	8.5
25	160	71	182	130	10
32	175	77	193	131	12
40	190	85	203	126	14
50	210	95	217	126	18
65	235	111	236	126	26
80	265	123	253	126	32

Nominal Diameter (mm)	L (mm)	H₁ (mm)	H₂ (mm)	K (mm)	Weight (kg)
15	145	78	175	130	8
20	150	73	180	130	8.5
25	160	71	182	130	10
32	175	77	193	131	12
40	190	85	203	126	14
50	210	95	217	126	18
65	235	111	236	126	26
80	265	123	253	126	32

Nominal Diameter (mm)	L (mm)	H₁ (mm)	H₂ (mm)	K (mm)	Weight (kg)
15	145	78	175	130	8
20	150	73	180	130	8.5
25	160	71	182	130	10
32	175	77	193	131	12
40	190	85	203	126	14
50	210	95	217	126	18
65	235	111	236	126	26
80	265	123	253	126	32