Fushiman DMD31 type differential pressure valve for gas

Manufacturer: Fushiman Co.,LTD.
Model: DMD31

Model	Nominal diameter	Primary pressure measurement	Differential pressure setting range	Maximum operating temperature	Body Material	Connection
DMD31	32〜100	Max. 1.0 MPa	0.035 to 0.7 MPa	80℃	FC	Flanges

The DMD31 differential pressure valve is used in gas combustion lines, etc.
The primary valve is the PMD31 pressure reducing valve. For detailed specifications of the primary valve, please refer to the PMD31 pressure reducing valve (page 20 and beyond).

Specifications and Performance

Nominal Diameter			32	40	50	65	80	100
Main Valve Fluid			Non-corrosive gases, including air
Detecting Fluid			Non-corrosive gases, including air
Primary Side		Maximum Pressure P₁	1.0 MPa
		Maximum Temperature	80°C
Secondary Side Pressure P₂			0.035〜0.7MPa
Detecting Pressure P₃			1.0 MPa or lower
Differential Pressure Setting Range ΔP (P₂ – P₃)			Refer to the right table
Main Valve Performance (1)	Cv Value (3)		6.3	8.3	13	21	29	50
	Minimum Pressure Difference (P₁ – P₂)		0.02MPa
	Offset (3)		10% or less of the maximum set pressure
	Shut-off Pressure Rise (3)		0.01〜0.02MPa
	Minimum Adjustable Flow Rate (3)		5–10 m³/h (standard state)
	Valve Seat Leakage Rate		0.01% or lower of rated flow
Main Component Materials	Valve Body		Cast Iron
	Spring Guard		Cast Iron
	Valve Body		Stainless Steel (Contact Surface with Synthetic Rubber)
	Valve Seat		Bronze
	Diaphragm		Synthetic Rubber
Main Valve & Pipe 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 PMD31 pressure reducing valve (see page 20 for reference).
Offset, shut-off pressure rise, and minimum adjustable flow rate are reference values (target values).

Structure and Dimensions

DMD31

Dimensions

Nominal Diameter (mm)	L (mm)	H₁ (mm)	H₂ (mm)	H₃ (mm)	E (mm)	Weight (kg)
32	175	80	347	136	155	14
40	190	80	347	136	155	16
50	195	80	347	136	155	17
65	230	104	443	163	210	34
80	250	104	443	163	210	35
100	290	127	481	185	250	58

Installation Example

The nominal diameter selection and piping examples for the DMD31 differential pressure valve are the same as those for the PMD31 pressure reducing valve (pages 21 and 22).
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)	H₃ (mm)	E (mm)	Weight (kg)
32	175	80	347	136	155	14
40	190	80	347	136	155	16
50	195	80	347	136	155	17
65	230	104	443	163	210	34
80	250	104	443	163	210	35
100	290	127	481	185	250	58

Nominal Diameter (mm)	L (mm)	H₁ (mm)	H₂ (mm)	H₃ (mm)	E (mm)	Weight (kg)
32	175	80	347	136	155	14
40	190	80	347	136	155	16
50	195	80	347	136	155	17
65	230	104	443	163	210	34
80	250	104	443	163	210	35
100	290	127	481	185	250	58

Nominal Diameter (mm)	L (mm)	H₁ (mm)	H₂ (mm)	H₃ (mm)	E (mm)	Weight (kg)
32	175	80	347	136	155	14
40	190	80	347	136	155	16
50	195	80	347	136	155	17
65	230	104	443	163	210	34
80	250	104	443	163	210	35
100	290	127	481	185	250	58