Fushiman DPD41L-2 type differential pressure valve for gas

Manufacturer: Fushiman Co.,LTD.
Model: DPD41L-2

Model	Nominal diameter	Primary pressure measurement	Differential pressure setting range	Maximum operating temperature	Body Material	Connection
DPD41L-2	15〜25	Max. 1.0 MPa	0.03 to 0.15 MPa	80℃	CAC,FCD	Screw-in flange

The DPD41B-2 and DPD41L-2 differential pressure valves are used in gas combustion lines, among other applications.
The main valve used as a base is the PPD41B-3 or PPD41L-3 pressure reducing valve.
For detailed specifications of the main valve, please refer to the PPD41B-3 pressure reducing valve (page 24 and beyond) or the PPD41L-3 pressure reducing valve (page 29).

Specifications and Performance

Model			DPD41B-2			DPD41L-2
Application			Medium Pressure, Small Flow Rate			Low Pressure, Small Flow Rate
Nominal Diameter			15	20	25	15	20	25
Main Flow Medium			Non-corrosive gas
Pilot Flow Medium			Non-corrosive gas
Primary Side		Maximum Pressure P₁	1.0MPa			0.3MPa
		Maximum Temperature	80֯C			60֯C
Secondary Pressure P₂			0.03〜0.2、0.1〜0.75MPa			0.02 〜0.14MPa
Pilot Pressure P₃			≤ 0.6MPa			≤ 0.12MPa
Set Pressure Differential Range △P (P₂ – P₃)			0.03 〜0.15MPa			0.01〜0.02MPa
Main Valve Performance (1)	Cv Value (3)		1.8	2.6	3.9	1.8	1.8	1.8
	Minimum Differential Pressure (P₁ – P₂)		0.02MPa			0.02MPa
	Offset (d)		Within 10% of the set pressure			About 10% of the maximum set pressure
	Shut-off Pressure Increase		≤ 0.02MPa			About 5% of the maximum set pressure
	Minimum Adjustable Flow Rate		1 m³/h (standard condition)			Approximately 0.3 m³/h (standard condition)
	Valve Seat Leakage		≤ 0.01% of the rated flow rate			≤ 0.01% of the rated flow rate
Main Component Materials	Valve Body		Bronze or Spheroidal Graphite Cast Iron			Spheroidal Graphite Cast Iron
	Spring Retainer Tube		Bronze
	Valve & Valve Seat		Stainless Steel Mesh (Valve Contact Surface: Synthetic Rubber)
	Diaphragm		Synthetic Rubber
Main Valve Connection			Threaded Type JIS Rc or Flange Type JIS 10K Full-Face

Note:

The main valve performance values are based on the condition where the pilot output pressure (P₃) is 0 kPa (atmospheric pressure).
The Cv values and maximum flow rates are the same as those for the PPD41B-3 pressure reducing valve (page 24) or the PPD41L-3 pressure reducing valve (page 29). Please refer to them for details.
The offset, shut-off pressure increase, and minimum adjustable flow rate are reference values (nominal values).

Remarks:

The above specifications are for reference only. We will review them individually according to your usage conditions.

Structure and Dimensions

Note (4):

The pilot output pressure (P₃) hole is positioned at a right angle on the right side when viewed from the downstream side.
This diagram shows the DPD41B-2 model (the DPD41L-2 model differs slightly).

Dimensions

Model	Valve Body Material & Pipe Connection	Nominal Diameter	L	H₁	H₂	H₃	E	Weight (kg)
DPD41B-2	Bronze (Threaded Type)	15	80	43	133	68	100	2.8
		20	115	47	180	80	130	5.5
		25	170	47	180	80	130	5.5
	Spheroidal Graphite Cast Iron (Flange Type)	15	95	43	133	68	100	4.6
		20	130	47	180	80	130	7.9
		25	215	55	170	130	130	10.9
DPD41L-2	Threaded Type / Spheroidal Graphite Cast Iron	15	95	43	133	68	100	3.0
		20	130	47	180	80	130	5.8
		25	130	47	180	80	130	5.8
	Spheroidal Graphite Cast Iron (Flange Type)	15	95	43	133	68	100	4.6
		20	130	47	180	80	130	7.9
		25	215	55	170	130	130	8.9

Installation Example

The nominal diameter selection and piping examples for the DPD41B-2 and DPD41L-2 differential pressure valves are the same as those for the PPD41B-3 pressure reducing valve (pages 24, 25) and the PPD41L-3 pressure reducing valve (page 29). Please refer to them.