Views: 0 Author: © 2024 Nanjing Zhuoyi Control Technology Co., Ltd. All rights reserved. Publish Time: 2025-07-22 Origin: https://zoehyd.com/directional-solenoid-valve-hydraulic-two-position-four-way-and-two-position-five-way-what-is-the-difference-between-a-few-several-passes-is-what-it-means/?srsltid=AfmBOorsQWj24rDxm9
What is the difference between two-position four-way valve and two-position five-way valve? Many people might struggle with this concept. Even some engineers who are new to the industry may not understand what is meant by the terms “a few directional solenoid valve hydraulic ” or “a few” . Today, we will clarify this issue properly.
Directional hydraulic solenoid valves use electromagnetism to control industrial equipment and manage fluid automation. These valves function as actuators and serve both hydraulic and pneumatic systems. Used in industrial control systems to adjust the direction of the medium, flow, speed and other parameters. You can combine electromagnetic valves with different circuits to achieve the desired control, while ensuring precision and flexibility in control.
In a directional hydraulic solenoid valve, the design includes a closed chamber with open holes at different locations, each connected to a different oil pipe. A piston sits in the middle of the cavity, and two solenoids are positioned on either side. When you energize a solenoid coil on one side, the valve body attracts to that side. By controlling the valve body’s movement, you open or close different drain holes. The inlet holes always remain open, allowing hydraulic oil to enter various drains. This oil pressure then pushes the cylinder piston, which drives the piston rod and, in turn, the mechanical device. The piston drives the piston rod, and the piston rod drives the mechanism.
In this way, through the control of the electromagnet current breaks the control of mechanical movement. The solenoid valve in a pneumatic system works for the same reasons as in other applications. However, the two applications use different working media, which leads to some differences in product design. Therefore, you cannot use the same product for both applications.
We commonly used in the production of solenoid valves 2-position 2-way general-purpose valves, 2-position 3-way valves, 2-position 4-way valves, 2-position 5-way valves, etc.; to understand the difference between 2-position 4-way valves and 2-position 5-way valves, the first thing you need to know about directional solenoid valve hydraulic, ‘bit’ and ‘through’ the meaning.
In pneumatically operated directional solenoid valves, we consider ‘position’ and ‘through’ as important concepts. Different ‘through’ and ‘bit’ constitute different types of pneumatic directional solenoid valve. Often referred to as ‘two-position valve’, ‘three-position valve’ refers to the spool of the directional valve has two or three different working positions. The terms ‘two-way valve’, ‘three-way valve’, and ‘four-way valve’ refer to directional valves with bodies that have two, three, or four different interfaces for connecting to various oil or gas lines in the system. The spool shift within the valve allows for switching communication between these different ports.
The term ‘several’ depends on the number of operating conditions the valve has; for example, if there are pneumatic component symbols, you can understand the number of positions by looking at the symbols on the diagram. The diagram will show the valve body with squares, arrows, or T lines to represent the number of positions. The back of the ‘several passes’, is on behalf of one of the square has a few points (and the arrow line and the T line intersection point), is a few passes.
1, with the box indicates the valve’s working position, there are a few boxes means there are a few ‘position’;.
2、The arrow in the box shows that the oil circuit is connected, but it does not necessarily indicate the actual direction of the liquid flow;
3、The symbol ‘┻’ or ‘┻’ in the box indicates that the circuit is not accessible.
4、 the number of interfaces connected to the outside of the box there are several, it means a few ‘through’.
5、 in general, the valve and the system supply oil or gas connected to the inlet / inlet with the letter p; valve and the system back to the oil / gas connected back to the oil / return port with t (sometimes with o); and the valve and the executive element connected to the oil / gas port with a, b and so on. Sometimes in the graphic symbols with l that leakage oil port.
6、 directional valves have two or more working positions, one of which is the normal position, that is, the spool is not subject to manipulation of the position of the force. Graphic symbols in the middle position is the three-position valve of the normal position. A two-position valve that uses a spring to reset the valve has its normal position as the path state in the box near the spring. When you draw a system diagram, you should normally connect the oil/air circuit to the normal position of the directional valve.
The 2-position 4-way and 2-position 5-way are the same in achieving the function, and there are some differences in the application:
1、 We usually use a 2-position 4-way directional valve in hydraulic control to collect oil. In contrast, we use a 2-position 5-way directional valve in pneumatic control. This type of valve allows us to discharge compressed air freely. Since pneumatic systems do not require recycling of the air, this approach is effective.
2、 We usually use a 2-position 4-way directional hydraulic solenoid valve in mechanical and manual valves. When we use electromagnetic control, we generally use a five-way valve structure. We limit the electromagnetic force, so we need to achieve the minimum spool action while meeting directional requirements. Designing it as a five-way valve structure makes it easier to achieve the small range of spool action needed for directional control.
3、 The 2-position 5-way directional solenoid valve hydraulic has two exhaust holes. You can add a flow control valve to this setup. This addition allows you to control the cylinder’s moving speed in both directions, with adjustable switching speeds. It also helps to reduce exhaust noise and minimize cylinder shock and vibration.
We call a directional hydraulic solenoid valve controlled by only one solenoid a single electric control valve. The position of the slide valve corresponds to ‘power on’ and ‘power off’.
We call a directional hydraulic solenoid valve controlled by two solenoids a double electric control valve. The position of the slide valve corresponds to the last solenoid coil receiving an electrical signal.
Single electric control valve: the coil is energised to one state (let’s call it state ‘1’); when the coil is de-energised, the two-position valve ‘automatically’ resets to the original state (‘0’ state). –Note: it is the ‘automatic’ reset when power is lost.
In a dual-coil two-position valve, when you energize “coil one” and de-energize “coil two,” the valve corresponds to the “1” state. When you energize “coil two” and de-energize “coil one,” the valve corresponds to the “0” state. When we energise ‘coil two’ and de-energise ‘coil one,’ the two-position valve switches to the ‘0’ state. When both coils are de-energised simultaneously, the two-position valve maintains the state it had before de-energisation. — Note: ‘maintains’ the original state. There is no ‘automatic reset’ function.
The former does not have a ‘hold’ function and the latter does not have an ‘automatic reset’ function. In different applications, you should use two-position valves with varying control characteristics. (In dual-coil hydraulic directional solenoid valves, we do not allow both coils to be energized simultaneously. We can prevent this by adding interlocks to the control circuit.)
