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Price: $ 515.00
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Part Number: 1279
Usually ships in: 1-2 weeks
Shipping weight: 6.00 lbs

  • Maximum Cv = 0.03
  • All 316ss construction
  • 4-20mA or 1-5 VDC input
  • 1/8 percent resolution (new)
  • Controls liquids and gases
  • Low cost
  • No stick-slip
  • Adaptive noise filter (new)
  • Compact size
  • Five year warranty

Owner's Manual

12 Volt DC Power Supply


The EPV-SS-4MG Electronic Proportional Valve is a low-cost, computer-controlled proportional valve which directly accepts a 4-20 mA or 1-5V DC control signal. The EPV performs better, costs less to install and less to operate than competitive valves. It is ideal for accurate control of liquid and gas flow.

The EPV has no backlash and no hysteresis. This greatly simplifies control programs. The valve is opened and closed by a zero-backlash screw mechanism. A step motor is directly connected to the valve without gears. The valve can also be operated manually.

An adaptive digital noise filter eliminates dithering of the valve due to noisy control signals. This digital filter can be disabled via a switch on the circuit board.

The EPV actuator is connected to a high-quality needle valve by a stainless steel bellows coupling.

The compact size of the EPV makes it easier to handle, and allows it to be installed in smaller spaces. The EPV is about one-third the size of a pneumatic valve.

An EPV installation costs less than a comparable pneumatic control valve system. There is no need for compressed air, filters, regulators, I-P converters, or pneumatic air lines. Simply connect the EPV to the control signal and the power supply.

The EPV is backed by a five (5) year warranty. The reliable, low-maintenance design and heavy-duty construction reduce costly downtime.

The EPV-SS-4MG is made from type 316 stainless steel. It has 1/4 inch NPT male fittings with a 0.056 port size and a maximum Cv of 0.03.

Try our interactive valve sizing calculator to help you select the correct valve for your application.

The old instruction manual can be found here.



Updated March 1, 2016
Type: Single-board microcontroller with 10 bit AD converter
Control: Open-loop
Inputs: 4-20 mA current or 1 - 5 VDC voltage for position. Switch selectable.
Input Impedence:
4-20mA selected: 250 Ohm
1-5 VDC selected: 32K Ohm
Signal floats, or is grounded, switch selectable, and has 1M Ohm isolation from analog circuit
Outputs: None
Modes: Full range, direct acting only
Adaptive digital filter on or off via switch
Adjustment: None
Temperature: 32 F to 120 F (0 C to 49 C)
Humidity: 10 to 80% non-condensing
Enclosure: Stainless steel, general purpose
Power supply: 12-24 VDC, 1.5A (1043 Power Supply recommended)
Power: consumption 23 Watts maximum, 1 Watt typical


Type: DC step motor, 200 steps/revolution, 4 revolutions for full stroke
Resolution: 800:1 (0.125%)
Speed: 45 RPM - 5 seconds full stroke
Torque: 57.5 oz-in peak


Type: Needle, In-line
Port Size: 0.056 inch
Cv: 0.03
Flow characteristics: linear
Valve body material: Type 316 stainless steel
Valve trim material: Type 316 stainless steel
Seat seal material: Type 316 stainless steel
O-ring material: fluorocarbon
Pipe size: 1/4 inch
Connection: 1/4 inch NPT male fitting
Static Pressure: 1000 psi
Differential Pressure: 0 - 1000 psi
Temperature: -10 - 400 Degrees F (-23 - 204 C)
Stem Seal: fluorocarbon O-ring in stem groove
(Neoprene, silicone and other O-ring materials also available)
Stem Motion: Rotational and reciprocal


Dimensions: 8.0 x 3.5 x 2.5
H x W x D

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Hass Manufacturing Company
371 NY Highway 351, Averill Park, NY  12018  USA
Tel (518) 674-8151  Fax (518) 674-8157

Information subject to change without prior notice.

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