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?

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.

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.

COVNA 2W Brass Electric Solenoid Valve

COVNA 2W Brass Electric Solenoid Valve – General Purpose

2W General Purpose Brass Electric Solenoid Valve

with low cost. Zero pressure to start. Max. temperature: -10~80℃. Suitable for water, air, gas, etc. Features of 2W solenoid valve include quick strat, compact design, low price, pure copper coil. As a solenoid valve supplier, COVNA is committed to helping you select the right and quality solenoid valve and save your time and cost. Inquiry us to get the best price!

模型

功能常闭/常开
压力：0 至 10 巴
电压：DC-12V、24V；AC-24V、120V、240V/60Hz；110V、220V/50Hz
介质温度：-10至80℃（14℉至176℉）
适用介质水、空气、油、气体等
Material: Brass

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Features Of 2W Brass Electric Solenoid Valve

● This item is our lowest cost item. If you have a limited budget, we will recommend this item for you.

● Compact design for small equipment for fluid control.

● Suitable for general mediums like water, oil, air, gas, etc

● Available in G and NPT threaded.

● Also available in stainless steel and PVC material for your choice.

Technical Parameters of 2W Brass Electric Solenoid Valve

端口尺寸	1/4″, 3/8″, 1/2″, 3/4″, 1″, 1¼”, 1½”, 2″	孔径（毫米）	8, 10, 15, 20, 25, 32, 40, 50
连接	BSPP, BSPT, NPT, G	功能	常闭/常开
压力	0 to10 bar	电压	直流-12V、24V；交流-24V、120V、240V/60Hz；110V、220V/50Hz
介质温度	-10至80℃（14℉至176℉）	适用媒体	水、空气、石油、天然气等
材料	Brass	应用	水处理、自动机械等

尺寸	端口尺寸	孔口	Cv	最小压力	最大压力
尺寸	端口尺寸	孔口	Cv	最小压力	AC(40VA)	DC(18W)
2W-10	3/8″	10	4.5	0.0 兆帕	0.7 兆帕	0.7 兆帕
2W-15	1/2″	15	4.5	0.0 兆帕	0.7 兆帕	0.7 兆帕
2W-20	3/4″	20	9.3	0.0 兆帕	0.7 兆帕	0.7 兆帕
2W-25	1″	25	12	0.0 兆帕	0.7 兆帕	0.7 兆帕
					AC(50VA)	DC(20W)
2W-32	1 1/4″	32	24	0.0 兆帕	1.0 兆帕	1.0 兆帕
2W-40	1 1/2″	40	29	0.0 兆帕	1.0 兆帕	1.0 兆帕
2W-50	2″	50	48	0.0 兆帕	1.0 兆帕	1.0 兆帕

Dimension of 2W Brass Electric Solenoid Valve

端口尺寸	3/8"~2"	孔径（毫米）	15, 20, 25, 32, 40, 50
港口航线	BSPP、BSPT、NPT、法兰	功能	常闭或常开
压力	0-1.0 兆帕（10 巴）	电压	直流-12V、24V；交流-24V、120V、240V/60Hz；110V、220V/50Hz
介质温度	-10~100℃（14℉ 至 212℉）	适用媒体	水、气、油等
材料	黄铜、不锈钢	密封材料	NBR、VITON、PTFE、EPDM
线圈	S51B,30VA(AC),24W(DC),IP65,100%ED
线圈	SD01B,28VA(AC),36W(DC),IP65,100%ED

我的自动阀门上的执行器可以工作，但阀门无法转动。为什么会这样？

很可能是阀杆或执行器联轴器断裂。

为什么我的阀门在执行器操作时不能完全打开或关闭？

电动推杆限位开关或气动推杆位置挡块未正确调整。

当我给气动执行阀上的电磁铁通电时，阀门无法转动。为什么会这样？

可能是因为电磁阀没有气压或有污物堵塞。另外，阀内可能有杂物。或者，气压不足以操作执行机构。记住：测量执行机构的气压，而不是压缩机的气压。

我能否购买一家制造商的执行机构，并将其安装到另一家制造商的阀门上？

可能。首先，要确保执行机构的扭矩输出足以可靠地转动阀门。其次，您必须定制一个安装支架和联轴器，以便将执行机构与阀门连接起来。

如果我的电动执行机构在执行周期中途断电，会发生什么情况？

阀门将在全开和关闭之间的某个位置停止。当电源重新接入原始电路时，执行器将完成循环。

我错误地订购了一个故障打开的气动执行阀。我需要的是一个故障关闭阀。我该怎么办？

更换时，只需将执行机构从阀门上卸下，将其或阀杆旋转 90 度，然后重新安装执行机构即可。

我已经在管路中安装了自动阀门，但现在我不知道阀门是处于打开还是关闭位置。如何才能知道呢？

从阀门上卸下执行机构并检查阀杆。当阀门处于关闭位置时，大多数球阀的阀杆平面与流量成直角。在蝶阀上，检查阀杆流量箭头标记。

控制气动执行器气源的电磁阀是否必须安装在执行器上？

从阀门上卸下执行机构并检查阀杆。当阀门处于关闭位置时，大多数球阀的阀杆平面与流量成直角。在蝶阀上，检查阀杆流量箭头标记。

如何为电动推杆接线？

检查执行机构附带的电气接线示意图，了解正确的连接方式。有时在执行机构盖子内就有一份。如果没有，不要猜测连接方式。致电制造商索取示意图。

我刚刚安装了一个电动阀门，当我给它通电时，阀门会旋转 360 度，而且不会关闭。出了什么问题？

执行机构的接线不正确（检查执行机构附带的原理图），或者外部控制开关的类型与执行机构不匹配。

我的电动推杆周期太快，能不能慢下来？

除非你买的时候选装了速度控制器。

我刚把电磁阀换成了电动阀，但它无法工作。为什么会这样？

执行器和电磁阀需要不同类型的电气控制开关。执行机构使用 SPDT 开关，电磁阀使用 SPST 开关。请查看执行机构接线示意图，了解正确的接线和开关类型。

仍有困惑？请联系我们！

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COVNA 2W Brass Electric Solenoid Valve – General Purpose

2W General Purpose Brass Electric Solenoid Valve

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