HK-C Electric Control Valve

COVNA Products

Control valves help manage flow, pressure, and level in pipelines. They automatically adjust valve opening based on position signals to maintain the desired flow, pressure, or level.

An electric control valve is a type of control valve whose electric actuator controls the valve's opening or closing. This actuator is a critical component of plant process control, allowing for automated and precise flow management.

Model

Actuator Type :Electronic Electric Actuator
Body Material: WCB or Stainless Steel 304/316/316L
Pressure: 10 / 16 / 20 / 40 / 64 Bar (145 / 232 / 290 / 580 / 928 psi)
Temperature Of Media: -40 to 450℃ (-40℉ to 842℉)
Suitable Media: Water, Air, Oil, Gas, Steam, etc
Voltage: AC220V 50Hz
Connection Type: Flanged (ANSI, JIS, DIN, GB)

Technical Parameter of Electric Control Valve:

Nominal Diameter (mm)		25	40		50	65	80	100	150		200	250	300
Rated Flow Coefficient Kv	Straight Line	6.9 11	17.6	27.5	27.5 44	44 69	69 110	110 176	275	440	440 690	690 1000	1000 1600
	Equal Percentage	6.3 10	16	25	25 40	40 63	63 100	100 160	250	400	400 630	630 900	900 1400
Rated Stroke		16	25			40			59			100
Actuator Model		381LSB-20	381LSB-30			381LSB-50			381LSB-65			381LSB-99
Allow Differential Pressure		6.4						4.2	4.6		3.7	2.7	2.2
Control Signal		4-20mA dc, 1-5 Vdc
Power Supply		220C AC 50Hz
Nominal Pressure (bar)		16 / 40 / 64
Operating Temperature		WCB: -40℃to 250℃or -40 to 450℃ Stainless Steel: -40℃to 250℃or -60℃ to 450℃
Intrinsic Flow Characteristics		Straight line, equal percentage(inherent adjustable ratio 50:1)

Valve body	ZG230-450, ZG1Cr18Ni9Ti, ZG0Cr18Ni12Mo2Ti, or equivalent US brand WCB, CF8, CF8M
Spool, Sleeve single seat	1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti, or similar US grade 304, 316
Filler	Polytertrafluoroethylene, flexible graphite

Technical Parameter of Electric Control Valve:

The actuator on my automated valve operates, but the valve won’t turn. Why?

Most likely the valve stem or actuator coupling is broken.

Why doesn’t my valve open or close completely when the actuator operates it?

The electric actuator limit switches or the pneumatic actuator position stops are not correctly adjusted.

When I energize the solenoid on my pneumatic actuated valve, the valve won’t turn. How come?

Probably because there is no air pressure to the solenoid or dirt has jammed it. Also, debris might be trapped inside the valve. Or, the air pressure is not sufficient to operate the actuator. Remember: measure air pressure at the actuator, not at the compressor.

Can I buy an actuator from one manufacturer and mount it to a valve from another manufacturer?

Maybe. First, be sure that the actuator torque output is sufficient to turn the valve reliably. Second, you will have to fabricate a custom mounting bracket and coupling to connect the actuator to the valve.

What happens if I lose power to my electric actuator in the middle of an actuation cycle?

The valve will stop somewhere between full open and close. When power is reapplied to the original circuit, the actuator will complete the cycle.

I ordered a fail open pneumatic actuated valve by mistake. I needed a fail closed one. What can I do?

To make the change just remove the actuator from the valve and turn it, or the valve stem, 90 degrees and remount the actuator.

I’ve installed my automated valve in the line, but now I don’t know if the valve is in the open or closed position. How can I find out?

Remove the actuator from the valve and check the valve stem. Most ball valves have stem flats at right angles to the flow when the valve is in the off position. On butterfly valves check the stem flow arrow marking.

Do I have to have the solenoid valve that controls the air supply to my pneumatic actuator mounted right on the actuator?

How do I wire up my electric actuator?

Check the electric wiring schematic that came with the actuator for the correct hookup. Sometimes a copy is inside the actuator cover. If it is missing, don’t guess about the connections. Call the manufacturer for a schematic.

I’ve just installed an electric actuated valve and when I power it, it turns the valve 360 degrees and won’t shut off. What’s wrong?

The actuator is wired incorrectly (check the schematic accompanying the actuator), or the external control switch is not the correct type for the actuator.

My electric actuators cycle time is way too fast, can I slow it down?

Not unless you bought it with an optional speed control.

I just replaced a solenoid valve with an electric actuated valve and it won’t work. Why?

Actuators and solenoid valves require different types of electrical control switches. SPDT for actuators, SPST for solenoids. Check the actuator wiring schematic for the correct wiring and switch type.