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 HK07 Pilot Operated Diaphragm Solenoid Valve – Brass - COVNA: Industry-Leading Manufacturer of High-Performance Valves

COVNA HK07 Pilot Operated Diaphragm Solenoid Valve – Brass

HK07 Brass Pilot Operated Diaphragm Solenoid Valve

with less power consumption for long time working. Applied to pressure system opened from 0.3 bar. Max. pressure is 16 bar. Longtime working. COVNA is a 21-year experienced manufacturer of solenoid valves for various applications like water treatment, HVAC, solar equipment, etc. Come and inquire us to get the cost-effective valve solution!

Model

Funkcija: Normalno zaprto / normalno odprto
Tlak: od 0,3 bara do 16 barov
Napetost: DC-12V, 24V; AC-24V, 120V, 240V/60Hz; 110V, 220V/50Hz
Temperatura medija: -(14℉ do 176℉).
Primerni mediji: Voda, zrak, olje, plin itd.
Material: Brass

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Značilnosti elektromagnetnih ventilov COVNA HK07

● Low power consumption for a long time working.

● Pressure ranges from 0.3 to 16 bar with a wide range of applications

● Long lifespan up to 1 million cycles.

Tehnični parametri elektromagnetnih ventilov COVNA HK07

Velikost pristanišča	1/2″, 3/4″, 1″, 1.2″, 1.5″, 2″	Odprtina (mm)	15, 20, 25, 32, 40, 50
Nit pristanišča	NPT, G	Funkcija	Normalno zaprto / normalno odprto
Tlak	od 0,3 bara do 16 barov	Napetost	DC-12V, 24V; AC-24V, 120V, 240V/60Hz; 110V, 220V/50Hz
Temperatura medija	-10 do 80 ℃ (14 do 176 ℃)	Primerni mediji	Water, Air, Oil, Gas, Fuel, etc
Material	Brass	Aplikacije	Čiščenje vode, avtomatski stroji itd.

Velikost	Velikost pristanišča	Odprtina	Cv	Minimalni tlak	Največji tlak
HK07-12	3/8″	12	4.5	0,03 MPa	1,6 MPa
HK07-15	1/2″	15	4.5	0,03 MPa	1,6 MPa
HK07-20	3/4″	20	9.3	0,03 MPa	1,6 MPa
HK07-25	1″	25	12	0,03 MPa	1,6 MPa
HK07-32	1 1/4″	32	24	0,03 MPa	1,6 MPa
HK07-40	1 1/2″	40	29	0,03 MPa	1,6 MPa
HK07-50	2″	50	48	0,03 MPa	1,6 MPa

Dimenzije elektromagnetnih ventilov COVNA HK07

Velikost pristanišča	3/8"~2"	Odprtina (mm)	15, 20, 25, 32, 40, 50
Nit pristanišča	BSPP, BSPT, NPT, PRIROBNICA	Funkcija	Normalno zaprto ali odprto
Tlak	0-1,0 MPa (10 barov)	Napetost	DC-12V, 24V; AC-24V, 120V, 240V/60Hz; 110V, 220V/50Hz
Temperatura medija	-10 ~ 100 ℃ (od 14 do 212 ℃)	Primerni mediji	Voda, plin, nafta itd.
Material	Medenina, nerjaveče jeklo	Material za tesnjenje	NBR, VITON, PTFE, EPDM
Tuljava	S51B,30VA(AC),24W(DC),IP65,100%ED
Tuljava	SD01B,28VA(AC),36W(DC),IP65,100%ED

Pogon na mojem avtomatiziranem ventilu deluje, vendar se ventil ne obrne. Zakaj?

Najverjetneje je zlomljeno steblo ventila ali sklopka pogona.

Zakaj se moj ventil ne odpre ali zapre v celoti, ko ga pogon upravlja?

Končna stikala električnega pogona ali pnevmatski omejevalniki položaja pogona niso pravilno nastavljeni.

Ko vklopim elektromagnet na svojem pnevmatskem ventilu, se ventil ne zavrti. Kako to?

Verjetno zato, ker v elektromagnetu ni zračnega tlaka ali pa se je v njem zataknila umazanija. V ventilu so lahko ujete tudi nečistoče. Ali pa zračni tlak ni zadosten za delovanje aktuatorja. Ne pozabite: zračni tlak izmerite na aktuatorju in ne na kompresorju.

Ali lahko kupim pogon enega proizvajalca in ga namestim na ventil drugega proizvajalca?

Morda. Najprej se prepričajte, da je izhodni navor pogona zadosten za zanesljivo vrtenje ventila. Drugič, izdelati boste morali montažni nosilec in spojko po meri za povezavo pogona z ventilom.

Kaj se zgodi, če električno gonilo izgubi napajanje sredi cikla sprožitve?

Ventil se ustavi nekje med popolno odprtostjo in zaprtostjo. Ko se v prvotni tokokrog ponovno dovede električna energija, bo aktuator dokončal cikel.

Po pomoti sem naročil pnevmatski ventil, ki se odpira po pomoti. Potreboval sem neuspešno zaprtega. Kaj lahko storim?

Za spremembo samo odstranite aktuator z ventila in ga ali steblo ventila obrnite za 90 stopinj ter ponovno namestite aktuator.

V linijo sem namestil samodejni ventil, vendar zdaj ne vem, ali je ventil v odprtem ali zaprtem položaju. Kako lahko to ugotovim?

Odstranite pogon z ventila in preverite steblo ventila. Pri večini krogelnih ventilov je steblo plosko pod pravim kotom glede na tok, ko je ventil v izklopljenem položaju. Pri metuljnih ventilih preverite oznako puščice za pretok na steblu.

Ali mora biti elektromagnetni ventil, ki krmili dovod zraka v pnevmatski pogon, nameščen neposredno na pogon?

Kako priključim električni pogon?

Pravilno priključitev preverite v shemi električnega ožičenja, ki je priložena aktuatorju. Včasih je kopija v pokrovu aktuatorja. Če je ni, ne ugibajte o priključkih. Za shemo pokličite proizvajalca.

Pravkar sem namestil ventil z električnim pogonom in ko ga vklopim, se ventil obrne za 360 stopinj in se ne izklopi. Kaj je narobe?

Pogon je napačno ožičen (preverite shemo, ki je priložena pogonu) ali pa zunanje krmilno stikalo ni pravilnega tipa za pogon.

Čas cikla mojega električnega pogona je prehiter, ga lahko upočasnim?

Ne, razen če ste ga kupili z dodatnim nadzorom hitrosti.

Pravkar sem zamenjal elektromagnetni ventil z električnim ventilom in ne deluje. Zakaj?

Aktuatorji in elektromagnetni ventili zahtevajo različne vrste električnih krmilnih stikal. SPDT za aktuatorje, SPST za elektromagnetne ventile. Za pravilno napeljavo in tip stikala preverite shemo napeljave aktuatorja.

Ste še vedno zmedeni? Kontaktirajte nas!

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COVNA HK07 Pilot Operated Diaphragm Solenoid Valve – Brass

HK07 Brass Pilot Operated Diaphragm Solenoid Valve

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