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Electric Water Valve

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What's The Electric Water Valve?

The electric water valve is an electric controlled valve which is commonly employed to control the flow of water, hot water and steam, gas and oil. There are various electric valve types, but the main variants are the pilot operated solenoid valve, direct acting solenoid valve and electric motorized ball valve.

Pilot operated solenoid valves: the most widely used, utilize system line pressure to drive the pilot to open and close the main orifice in the valve body, therefore to connect or shut off the pipeline.
Direct operated solenoid valves: directly open or close the main valve orifice. They are used in systems requiring low flow capacities or applications with low pressure differential across the valve orifice, expecially the medium is the hot water or steam.

The Motorized ball valves: operate in a similar fashion as manual ball valves. A ball set in the body of the valve has a hole in the center which controls the flow. An open ball valve will have the bore/hole in line with the flow. Turning the ball perpendicular will close the valve and stop the flow of media. An electrically actuated ball valve has a motor that does the turning for you.

Solenoid Operated Electric Water Valve

Solenoid valves are electromagnetic force operated valves that convert electric energy into mechanical energy. The water solenoid valve works is by controlling the flow of water in a positive, fully-closed or fully-open mode. They are often used to replace manual valves or for remote control.

Their main purpose is to regulate the movement of water and eradicate the need for an engineer to manually control the valve, saving time and money.

There two types Solenoid Operated Electric Water Valve. One is the Pilot operated, other model is direct acting model.

They consists of a coil, plunger, sleeve and valve body assembly. But no matter the structure, they both have two original settings. One is the normall closed model, other is normal open model.

Pilot Operated Electric Water Valve

Typical Structure

Part List

1. Fixation Nut-Steel with nickel plated

2. The Solenoid Coil-Copper

3. Plug Srping -Carbon Steel

4. Movalble Plunger

5. Plunger Water Exhaust Orifice

6. Plunger Seal Seat

7. Pilot Drain Port

8. Diaphragm Bleed Hole

9. Valve Orifice

10. Plunger Sleeve

11. Terminal Box-Plastic

12. Fixation nut-Steel or Stainless Steel

13. Diaphragm Spring

14. Diaphragm

CLOSED STATE

The original setting is closed state. After completed installation, and the water come into the valve. The water will overflow the upside chamber of the diaphragm though the bleed orifice⑧, therefore press the diaphragm tightly on the main valve orifice⑨.

Open Process

Closed State

Open State

The energized coil actuate a plunger④ opens the pilot orifice ⑦, by raising the it in the sleeve tube⑩.

To Open:

Step 1: When the valve is energized, the coil generate magnetic force to lift the plunger④. The plunger move upward and open pilot orifice⑦.

Step 2: The liquid upside of the diaphragm will get out from the pilot drain port⑦, even though the liquid will get in from the Diaphragm bleed hole⑧.

Step 3: This variation causing system pressure holding the diaphragm/piston closed to drop. As system pressure on the top of the diaphragm/piston declined.

Step 4: Full system pressure on the opposite side of the diaphragm lift the diaphragm away from the main valve orifice⑨, which allows the full media flow through the valve.

Direct Acting Operated Electric Water Valve

DIRECT-ACTING 2- WAY DIAPHRAGM VALVES(Normally Closed)
Two-way valves are shut-off valves with one inlet port and one outlet port. In the de-energized condition, the pluger spring, assisted by the fluid pressure, holds the valve seal on the valve seat to shut off the flow.

Inner structure of electric water valve

Electric Water Valve Part List

1. Fixation Nut-Steel with nickel plated

2. The Solenoid Coil-Copper

3. Plunger Srping -Carbon Steel

4. Plunger Exhaust Hole

5. Plunger Sealing Seat

6. Diaphragm Bracket

7. Diaphragm Orifice

8. Terminal Box-Plastic

9. Pilot Pluger- Steel

10. Fixation nut-Steel or Stainless Steel

11. Connect Spring(Plunger and Diaphragm bracket)

12. Diaphragm

13. Diaphragm Bleed Hole

CLOSED STATE

The original setting is closed state. After completed installation, and the water come into the valve. The water will overflow the upside chamber of the diaphragm though the bleed orifice⑫, therefore press the diaphragm tightly on the main valve orifice⑦.

Direct Acting Electric Water Valve Open Process

To Open:

Step 1: When the valve is energized, the coil generate magnetic force to lift the plunger⑨. The plunger move upward to open pilot orifice⑦, and meaning time lift the diaphragm bracket⑥ open the main valve orifice.

Step 2: The liquid upside of the diaphragm will get out from the Diaphragm Orifice ⑦, even though the liquid will get in from the smaller orifice⑬ (Diaphragm Bleed Hole).

Step 3: Full system pressure on the opposite side of the diaphragm/piston help to lift the diaphragm/piston away from the main orifice, which allows the full media flow through the valve.

Which electric water valve is better for your applications? Pilot Operated vs Direct Acting Operated!

Features of Pilot Operated valves

1. Excellent for very large flow.

As the sysem pressure assists valve diaphragm operation. It could hold bigger diaphragm.

2. Needs minimum pressure differential.

3. Could installed in Higher Pressure system

4. More economical for higher flow values

5. Lower electrical power needed.

6. As utilize the system pressure to open the diaphragm, so need longer response time.

7. In terms of manufacture cost, it’s more economical, as they don’t need the big and expensive coil to actuate.

8. The size is smaller than direct acting valve due to avoid the big and high power coil.

9. As only adopt the low power coil to actuate, it’s more energy efficient!

10. Compared with the direct acting valves, the operate process is more slightly.

11. Widely accepted by the end user and the engineer.

Features of direct acting valves

1. No need the minimum pressure differential when operate.

2. As the valve utilize the coil magnetic force to drive the diaphragm, so more reliable.

3. Lower pressure limit.

4. Lower cost efficiency.

5. Lower power efficiency.

6. Can handle a vacuum pressure of -14.7 psig and also much higher pressure ranges.

7. Designed to cope with particle debris.

8. 2/2 and 3/2 way normally open or normally closed versions.

9. The valve coil must be mounted vertically upward.

Motorized Ball Valve

Motorized valves reduces the hassle required to operate the valves manually. They are the popular and widely used among the different types of valves. They offer precise control over fluid flow and are commonly used for both on/off and modulating functions.

Part List

1. Motor Manipulative Box

2. Actuating shaft

3. PTFE Seal

4. Thread Port

5. Ball Handle

6. Valve Body

7. Ball

How many types there are?

1. According the port numbers, there are two types: two ports and three ports.

2. According to the ball valve’s material, there are brass, stainless steel and PVC motorized ball valve.

3. According to the wires of the motor, there are two wires, three wires, five wires model. And the timed motor are also widely used.

4.For the two ports mode, in terms of the relative position of the two ports, there are straight ports, 90° ports, 60° ports, 30° ports.

5. According to the motor types, there are Unidirectional motor which is not recommended, other is Bidirectional motor which will reduce the failure rate. Normally, the unidirectional motor be with two wires. Be sure you are purchasing the right valve.

Conclusion

Electric motorized ball valves are used in nearly every application that involves remotely stopping or starting the flow of a fluid. The above discussion is just a brief outline of the many types of electrically actuated valves; the variations are as numerous as the applications.

Solenoid Electric Water Valve VS Motorized Valve, which one is better?

Response Time

Solenoid Valve: They got very quickly response speed. Noramlly the actuate time less than 0.1s.

Electrically-actuated ball valves: They got relatively slow when opening and closing. Normally the geting the full open status needs 3-8s, some big port size valve even need more!

Actuation

Solenoid Valve: Though the magnetic force which generated by the solenoid coil to open the valve.

Electrically-actuated ball valves: Actuated by the electric motor to drive the ball element turning.

Working Pressure

Solenoid Valve: For the normally purpose valve, the working pressure will not exceed 140Psi. As most solenoid valve has the pilot mechanism which will assist in the open process. And for the some directing water valves, they need the lowest actuated pressure.

Electrically-actuated ball valves: They can withstand much higher levels pressure than the solenoid valve. And no lowest pressure limit when start the valve.

Service Life

Normally the Electrically-actuated ball valves last longer service life than solenoid valve. The reason is once the ball valve are opend or closed, the ball valve no needs the power supply.

Medium

Ball valves are a better choice for ropy media or with particulates. These can get stuck in solenoid valves and cause clogs, whereas with ball valves, the wiping motion of the ball against the seats tends to clear out debris.

Cost Comparison

Normally the ball valve’s price is a little higher.

Flow Rate

With the same pipe size, the ball valve be with much higher flow rate.

Manual Over-ride

Normally, the over-ride mechanism are available on the ball valves according to the client’s request. But no such stuctures on all of the water solenoid valve.

Water Hammer Effect

The long open or close process will reduce the hammer effect when adopt the ball valve. However, the water hammer effect of the solenoid valve is obvious because of the extremely short reaction time

Power Consumption

Compared with the ball valve, the solenoid valve need more power consumption. Typically, solenoid valves require power to open or close and more power to hold the valve in its energized state. Electric ball valves, though, only use power to open or close and don’t require power to stay in that position.

Failure Situation

Electric actuator versions do not typically include fail-safe design, but with could be with the manual over-ride mechanism. While, the solenoid valve include normal open, normal closed models. That’s include the failure consideration.

Maintenance

Electric ball valves typically require less maintenance than solenoid valves across their entire lifetime.

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Table of Contents

What's The Electric Water Valve?

Solenoid Operated Electric Water Valve

Pilot Operated Electric Water Valve

Typical Structure

Part List

Open Process

Closed State

Open State

Direct Acting Operated Electric Water Valve

Inner structure of electric water valve

Electric Water Valve Part List

Direct Acting Electric Water Valve Open Process

Which electric water valve is better for your applications? Pilot Operated vs Direct Acting Operated!

Features of Pilot Operated valves

Features of direct acting valves

Motorized Ball Valve

Part List

How many types there are?

Conclusion

Solenoid Electric Water Valve VS Motorized Valve, which one is better?

Response Time

Actuation

Working Pressure

Service Life

Medium

Cost Comparison

Flow Rate

Manual Over-ride

Water Hammer Effect

Power Consumption

Failure Situation

Maintenance