Yoshitake DP-16 diaphragm type solenoid valve is a highly reliable ultra-high performance pilot-operated valve. Equipped with stainless steel wetted parts, it ensures outstanding corrosion resistance. The valve provides zero seat leakage and supports both horizontal and vertical installation.

Designed for diverse industrial applications, the DP-16 series effectively handles air, cold and hot water, and oil (20 cSt or less) at working pressures up to 1.0 MPa. The series includes the standard normally closed model (DP-16), a normally opened variant (DP-16C), and DC coil options (DP-16D, DP-16CD) to suit various control requirements.

Specifications

Item	Specification
Application	Air, Cold and hot water, Oil (20 cSt or less)
Working pressure	0-1.0 MPa (unusable under vacuum)
Min. differential pressure	0 MPa (0.1 MPa or more is required for vertical installation)
Valve seat leakage	None (by confirming pressure gauge visually)
Max. temperature	60°C
Operation	Normally closed / Normally opened
Body Material	Stainless steel
Valve Material	NBR (diaphragm)
Connection	JIS Rc screwed

Additional Options

• Available with FKM diaphragm.
• Available with a terminal box (made of resin).

Coil Specifications

Rated voltage	AC100/200V, AC110/220V (50/60 Hz)	DC24V
Allowable regulation	Rated voltage ±10%	Rated voltage ±10%
Rated current	0.42/0.21A (100V/200V), 0.38/0.19A (110V/220V)	1.13A
Starting current	1.64/0.82A (100V/200V), 1.48/0.74A (110V/220V)	-
Insulation type	Class H	Class H
Protection structure	Dust-proof, Splash-proof	Dust-proof, Splash-proof
Degree of protection	IP64	IP64
Insulation resistance	More than 50MΩ / 500V megger	More than 50MΩ / 500V megger
Anti-voltage test	1500V/min	1500V/min

Dimensions and Weights

DP-16 (Normally Closed, AC Coil)

Nominal size	d	L (mm)	H (mm)	H1 (mm)	Weight (kg)
15A	Rc 1/2	70	109.5	14.5	1.1
20A	Rc 3/4	80	116.5	17.5	1.3
25A	Rc 1	95	123.5	21.0	1.7
32A	Rc 1-1/4	110	150.5	26.0	2.5
40A	Rc 1-1/2	120	157.5	29.5	3.1
50A	Rc 2	140	172.5	36.5	5.0

DP-16C (Normally Opened, AC Coil)

Nominal size	d	L (mm)	H (mm)	H1 (mm)	Weight (kg)
15A	Rc 1/2	70	172	14.5	1.4
20A	Rc 3/4	80	179	17.5	1.6
25A	Rc 1	95	186	21.0	2.0
32A	Rc 1-1/4	110	213	26.0	2.8
40A	Rc 1-1/2	120	220	29.5	3.4
50A	Rc 2	140	235	36.5	5.3

DP-16D (Normally Closed, DC Coil)

Nominal size	d	L (mm)	H (mm)	H1 (mm)	Weight (kg)
15A	Rc 1/2	70	124	14.5	1.9
20A	Rc 3/4	80	131	17.5	2.1
25A	Rc 1	95	138	21.0	2.5
32A	Rc 1-1/4	110	166	26.0	3.3
40A	Rc 1-1/2	120	173	29.5	3.9
50A	Rc 2	140	187	36.5	5.8

DP-16CD (Normally Opened, DC Coil)

Nominal size	d	L (mm)	H (mm)	H1 (mm)	Weight (kg)
15A	Rc 1/2	70	172	14.5	2.1
20A	Rc 3/4	80	179	17.5	2.3
25A	Rc 1	95	186	21.0	2.7
32A	Rc 1-1/4	110	213	26.0	3.5
40A	Rc 1-1/2	120	220	29.5	4.1
50A	Rc 2	140	235	36.5	6.0

Operation Mechanism

Opening Operation: When the power is turned ON, the coil is magnetized and the plunger is sucked up, thereby opening the pilot valve. The pressure at the upper part of the valve (diaphragm) flows to the outlet side via the pilot port, causing a pressure drop. The diaphragm is then pushed up by the inlet pressure, and the main valve is opened.

Closing Operation: When the power is turned OFF, the plunger is pushed down by a pin/kick spring and dead weight, thereby closing the pilot valve. The inlet pressure is introduced through the bleed port to the upper part of the diaphragm, equalizing the pressure. The diaphragm is then pushed down and closed by the spring.

Nominal Size Selection

Selection Chart for Air

Selection Chart for Water

Cv Values

Nominal size	15A	20A	25A	32A	40A	50A
Cv Value	4.4 (1.7)	8.1 (3.2)	11.5 (4.6)	17.0 (6.8)	23.3 (9.3)	30.5 (12.2)

Note: In case of inlet/outlet pressure differential being less than 0.01 MPa, the Cv value shown in brackets should be adapted.

Installation and Wiring

Installation Position

When the valve is used at 0.1 MPa or less, mount the valve to horizontal piping with the coil pointing upwards.

Installation and Wiring Warnings

• The valve is not for explosive atmospheres (not explosion-proof construction).
• Carry out the cable connection only after confirming that no power is supplied to prevent electric shock.
• Remove foreign matter and scales from the lines before connecting the valve.
• Install a strainer (Recommendation: 80-100 mesh) at the valve inlet side.
• Use electric wires which have a core of 0.75 mm² or more.
• Provide space around the valve so that it can be easily disassembled and inspected.

Troubleshooting

Problem	Cause	Countermeasure
Valve does not open	Power is not turned ON. Plunger is stuck by foreign matter. Fluid viscosity is 20cSt or more.	Check and turn on the power. Disassemble and remove foreign matter. Correct viscosity or change model.
Valve does not close	Scale or scratch on the plunger or valve disc. Inlet/outlet is in the opposite direction.	Disassemble and clean. Replace if scratched. Reinstall correctly.
Abnormal noise	Hexagon nut clamping the coil is loose. Foreign matter exists at the top of plunger.	Tighten it. Disassemble and remove the foreign matter.
External leakage	Gasket is damaged or cover tightening is defective.	Replace the gasket.

Maintenance and Disassembly

Safety Caution

Completely discharge internal pressure from the valves and lines, and cool the valves down to a level where you can touch it with bare hands before disassembly and inspection. Failure to do so may result in injury or burns.

Disassembly Procedure:

1. Remove the hexagon nut and the coil. Be careful not to lose the washer, O-Ring, etc.
2. Loosen the hexagon bolts by 2 to 3 mm, and make sure that the internal pressure has been discharged.
3. Carefully remove the hexagon bolts and the cover, and then pull out the valve assembly.
4. Re-assembly should occur in the reverse order. Always use a new gasket when reassembling.