There are many types of hydraulic valves available in the industry. Hydraulic valves are mechanical devices used to control fluid flow in hydraulic pipes or systems. They can be used to comprehensively control the level of flow to a specific area, redirect pressurized fluid, or shut off a line.
Hydraulic valves can be used to control the amount of liquid power as well as the flow of liquid in a circuit. As a result, the pressure and flow rate in various parts of the circuit will be controlled by these valves. Hydraulic valves can regulate the system pressure. The hydraulic valve relieves the pressure on the pump or lowers the temperature of the oil before it enters the hydraulic circuit. Different types of hydraulic valves are accessible from a wide range of suppliers and companies, as well as manufacturers and distributors, and Hydrointer has a wide range of hydraulic valves for sale.
Hydrointer's website has a comprehensive list of hydraulic valve services for all OEM fleets. Hiydrointer suppliers can help you with this. To learn more about how to connect with various service providers that consistently produce high-quality products, please contact Hiydrointer customer support.
Types of Hydraulic Valves
Hydraulic valves are available in various specifications similar to other valves, such as bypass, needle, adjustment, discharge, ball, butterfly, pilot operated, control, deflector, proportional and directional. In general, these hydraulic valves can be described as three main types:
Hydraulic Flow Control Valves
Hydraulic Pressure Control Valves
Hydraulic Directional Control Valves
Hydraulic Flow Control Valves
Hydraulic flow control valves are used in hydraulic systems to regulate the flow volume of the passing fluid. Such valves have a movable gate that changes the flow area to change the flow rate in the valve. For example, this type of hydraulic valve will be used in the control circuits of devices such as actuators, cylinders or motors. The speed of these devices is linearly a function of the flow rate, that is, lowering the flow rate reduces driving speeds and vice versa.
The different types of hydraulic flow control valves are moving flow control valves, pressure balanced flow control valves, stationary flow control valves and throttling flow control valves. The flow control method in these valves varies according to the mechanical shape of the valve, which is one of the well-known styles regularly in the same way as other valves:
Ball
Butterfly
Diaphragm
Needle
The Voucher
We can measure the flow rate in many different ways that are not similar, so choosing a flow control valve requires understanding what is expected of the flow rate. The three standard types of flow rates are:
Mass flow rate - we measure mass per unit time in units such as kg/min or slugs/sec.
Weight flow rate - we measure weight per unit time in units such as lb/sec.
Volumetric flow rate – we measure volume per unit time in units such as cc/min or in3/sec.
Some of the traditional hydraulic flow control valves are:
Proportional flow control valves with pressure compensation
deceleration valves
Proportional flow control logic valves
Variable flow valves with pressure and temperature compensation
Pressure-balanced, variable flow valves
Priority valves
Hydraulic Pressure Control Valves
Hydraulic pressure control valves, pass through hydraulic assemblies
it is used to regulate the most fluid pressure to keep it at the desired amount, constrained by the system operator. Fluid systems are typically manufactured to operate within a constant pressure december. These valves play a very important role in preventing pressure increases that can lead to hydraulic fluid leaks or explosion of pipes and tubes. They are also installed in such a way that they have the desired pressure in some parts of a hydraulic circuit.
In hydraulic systems, various pressure control valves are common, including reduction valves, relief valves, sorting valves, balancing valves and discharge valves.
Hydraulic Directional Control Valves
We use hydraulic directional control valves to track the fluid in a system or circuit to several devices as requested. They switch between different positions, such as extension, Deceleration or neutral positions, to control a hydraulic cylinder. They can also switch to intermediate states to control Deceleration, speed or direction of an actuator.
Discrete hydraulic Directional control valves are a simple form of dual valves that pass through, blocking the flow of liquid. If the fluid tries to pass in the opposite direction, the check valve closes the system using a ball, piston or buttock.
Hydraulic directional control valves with more complex characteristics can have multiple gates, because their characteristics allow them to exchange liquid within different ports, depending on the device with which they are supplied with hydraulic fluid. As a result, they are discriminated by standardized numbering systems with two values that are the same as 4/3 or 2/2. The first number indicates the number of valve ports, and the second number indicates the number of valve positions that the device can reach. According to this coding scheme, 2/2 represents a two-state valve and 4/3 represents a three-position four-state valve. there are three positions on the 4/3 valve that can be used to control a hydraulic cylinder:
Extension - the liquid enters the cylinder through a hydraulic pump, causing it to extend. Retraction - the liquid is delivered from the hydraulic pump to the rod end of the cylinder, which causes the cylinder to retreat. Neutral - all liquid ports are blocked, so there is no liquid flow. Here we list some classes for directional control valves. You can identify these valves by the following:
The number of flow paths at the end positions.
The number of reel positions.
The method of providing accumulation return.
Method of sliding a reel.
The flow model in the transition or center position.
Hydraulic Four Way Valves
Four-way directional control valves are installed to manage the direction of rotation of a fluid engine or the direction of fluid flow in a hydraulic line, which controls the movement of a running cylinder. These valves are usually the sliding roller model. Standard four-way directional control valves have four ports:
The output or return port is connected to a hopper.
The pressure line is connected to a pressure port.
Two operating ports are connected to one operating unit.
Four-way valves have a rectangular cast frame, a sliding spool and a way to insert a spool. A reel is a precision that is inserted into a hole by the longitudinal axis of a housing. The soil of a reel divided this hole into a number of separate chambers. The ports in the body of a valve lead to a partition, so that the condition of a spool determines which ports are open and which are closed. Ports that are isolated from others in one location can be connected to each other in different locations. Reel positioning is completed mechanically, electrically, manually or hydraulically.
The figure below shows how the reel position determines the possible flow states on the line. The four ports are labeled P, T, A, and B: P is connected to the flow chamber; T to the tank; and A to the ports of the hydraulic engine, cylinder, or any other valve on the road that operates A and B. In Figure A, the reel is in a position where port P is free to port A and port B is free to port T. The connection points A and B flow from the connection point P to the connection points of the cylinder and form the piston. of the cylinder to move to the right. The return flow from the cylinder passes through the connection points B and T. In Figure B, the port P is free to the port B and the piston moves to the left. The return flow from the cylinder reaches ports A and T.
The Function of the Hydraulic Control Valve
Several hydraulic directional control valves have spools. The rollers slide between the parts, allowing the liquid to flow through the open doors Decoupling depending on the condition of the roller in the housing. The valves may have one or more spools to achieve the designed port control. Other flow control elements in these valves can be poppets or pistons.
The valve part that operates these flow control components is known as the actuator or operator of the valve. These hydraulic valves can offer convenient timing or sequencing of valve position changes that need to control hydraulic systems or circuits. There are many possibilities for the actuator mechanism, including pilot, electrical/electronic, mechanical operation.
Mechanical Operation Mechanical operation may have manually operated valve controls, such as levers, buttons, or pedals, but it is more often automatic mechanical means, such as cams, levers, springs, and rollers.
Pilot start Pilot start applies pressurized fluid to help move the valve flow control elements. This style of operator also helps in dangerous situations where the performance of electrical/electronic equipment cannot be recommended due to the risk of causing a possible explosion.
Electrical/electronic actuation Electrical/electronic actuation requires solenoids that convert the electrical signals of the current supplied to the solenoid coil into the mechanical movement of a piston performing rotary or linear motion. Electric solenoids have some restrictions on generating power, so it is impossible to replace high-pressure hydraulic systems with direct response. The pilot operated coupling solenoid allows the solenoids to change the low pressure pilot operations to control the higher pressure ports.
Hydraulic Valve Specifications
Hydraulic valves are determined using various parameters related to their dimensions, connections, flow capacities and operating mechanisms. The typical characteristics of these valves are described below, but keep in mind that there may be exceptions to these parameters among different valve suppliers and manufacturers. Dec. Therefore, there may be design differences from supplier to supplier. The presented data should serve as a general indication of what should be considered when determining a hydraulic valve.
Valve type_, physical style (ball, check, needle, etc.) refers to the specific type of hydraulic valve required, which can indicate or refer to the discovered control (flow control, pressure control, or directional control).
The valve operating mechanism reflects how the valve position is changed or how the valve is operated, such as solenoid, pilot or mechanical.
The valve configuration shows the number of ports, the number of switching positions or states, and the rest state specified for the valve, for example 3/2 normally closed (NC).
Housing material classifies the material from which the valve body is manufactured: brass, bronze, aluminum, stainless steel or engineering plastic.
The medium type defines the type of specific liquid (liquid or gas) that the valve can handle without any harmful effects. Examples of media types include oil, fuel, and water.Dec.
The connection size indicates the dimensional dimensions of the inlet and outlet connection points of the valve designed in metric units such as millimeters or imperial units such as inches.
Port type (or mounting type) manifold for valve, with flange, gear, etc. classifies the desired mounting/interface or port style, for example.
The operating voltage is for electrically operated valves and indicates both the magnitude and the type of electrical control signal applied to energize the valve solenoid. Solenoid valves are prepared with a wide range of AC and DC operating voltages, which can be used to provide different application conditions.
For electrically operated valves powered by AC voltage, the operating frequency frequency is the number of cycles per second of alternating current connected to the solenoid, usually known as Hertz (for example, 60 Hz).
Flow coefficient The flow coefficient of the valve (Cv) measures the capacity of the valve to allow the flow of liquid through it. The traditional definition of the flow coefficient is that it refers to the volume of water (in US gallons) that will flow through the system at a temperature of 60oF within a one-minute period when there is a psi pressure drop (output-input). differential pressure) through the valve. Larger flow coefficient values mean a larger amount of flow.
Instead of the flow coefficient, the flow rate, valve suppliers can define the flow rate of the valve in units such as liters or gallons per minute.
The maximum rated pressure is the maximum pressure at which the valve can operate when installed in the hydraulic circuit.
The minimum operating pressure indicates the lowest pressure in the system for the effective operation of the valve. While many directly operated valves can operate at a pressure of 0 bar, indirectly operated valves may require a minimum pressure that can be used to support valve operation. Some valves are designed using a pressure December of.
December or December The operating temperature or temperature range indicates the predicted temperature range for which the valve is produced for operation.
The application indicates the expected use or Sunday of the valve, including elevators, chemicals or aircraft. An understanding of the industry can help October to bring to the surface additional qualities or characteristics required by these working conditions.
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