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Price: $ 870.00
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Part Number: 1044
Usually ships in: 2-3 weeks
Shipping weight: 9.00 lbs

  • Maximum Cv = 0.6
  • Brass with 303ss trim
  • 4-20mA or 1-5VDC input
  • 1/8 percent resolution NEW!
  • Adaptive digital filter NEW!
  • Controls liquids and gases
  • Direct or reverse acting
  • Full or split range
  • No stick-slip
  • Dither-free
  • Long-life rotary stem seal
  • Compact size
  • Five year warranty

Owner's Manual

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The ECV-250B-4X Electronic Control Valve is a computer-controlled proportional valve which directly accepts a 4-20 mA or 1-5V DC control signal. The ECV 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 ECV is field programmable. There is no need to stock an expensive inventory of actuators for normally open, normally closed, full range or split range operation. The ECV can be set to fail open or closed on loss of the control signal.

The ECV 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 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 valve design features a long-life rotary stem seal. Rotary seals are more durable and require less maintenance than reciprocating stem seals used in pneumatic valves. This seal does not cause the unwanted stick-slip action of pneumatic valves.

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

The ECV is easy to set up. The installer simply sets the dip switch. Setup typically takes less than 5 minutes.

An ECV 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 ECV to the control signal and the power supply.

The reliable, low-maintenance design and heavy-duty construction reduce costly downtime. Electronics are protected by a watertight, NEMA 4X rated ABS enclosure.

The ECV-250B-4X has a brass valve body with Type 303 stainless steel trim. It has 1/2 inch pipe fittings with a 1/4 inch port size and a Cv of 0.6

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



Type: Single-board microcontroller
Control: Open-loop
Inputs: 4-20 mA current or 1 - 5 VDC voltage for position. Switch selectable.
Two switch closures for full open, full closed or 50%
Switch closures override the control signal.
Input Impedence:
4-20mA selected: 250 Ohm
1-5 VDC selected: 32K Ohm
Signal floats or is grounded and has 1 MOhm isolation from analog circuit
Outputs: None
-Direct or reverse acting
-Full or split range
-High or low range
-Fail open or closed
-Adaptive digital filter on or off
-Modes are switch selectable
Adjustment: None
Temperature: 32 F to 120 F (0 C to 49 C)
Humidity: 10 to 80% non-condensing
Enclosure: NEMA Type 4X watertight ABS
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: Globe, In-line
Port Size: 1/4 inch
Cv: 0.6
Flow characteristics: linear
Valve body material: Brass
Valve trim material: Type 303 stainless steel
Seat seal material: 25 % glass filled TFE
O-ring material: ethylene propylene (standard - other materials available)
Pipe size: 1/2 NPT
Connection: Female pipe thread
Static Pressure: 300 psi
Differential Pressure: 0 - 120 psi
Temperature: 32 - 250 Degrees F (0 - 121 C)
Bonnet Seal: Encapsulated EPR O-ring
(Neoprene, silicone and other O-ring materials also available)
Stem Motion: Rotational


Dimensions: 8.5 x 7.3 x 5.4
H x W x D

Installation Drawing

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

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