The sectional valve is the directional control valve that is used for direction control of different sections of the fluid flow in a hydraulic system. It can add or remove the section, stock every individual section, and build different setups for controlling and replacing the sections as you need.
Sectional valves feature high efficiency, simple, compact, heavy-duty design, and low-pressure drop. Pressure drop refers to the pressure difference caused by the resistance to fluid flow between two points in a fluid network. Section valves have several operation methods, which include manual control, pneumatic control, hydraulic control, and electric control.
Typically, directional control valves including sectional control valves can regulate the start, stop, and direction switching of the flow. It is widely applied in hydraulic systems, using hydraulic oil as the pressure medium. Although monoblock valves also have similar functions and applications, sectional valves will be more suitable devices for high pressure and flow systems.
In a hydraulic system, the direction of the fluid flow is determined by the spool position. Hydraulic valves that direct the fluid flows can be divided into 3 categories: directional control valves, pressure control valves, and flow control valves. Sectional valves are a type of directional control valves. They can control the pressure and regulate the fluid flow with proportional control. Control valves that are used for directional control include directional poppet valves, directional spool valves, and check and non-return valves.
Sectional control valves are the direction spool valves that can provide multiple section control in the system. Spool works as the component of the valve, which has small leakage compared to the flow rate in the hydraulic system. Along the spool’s surface, there is a seal mounted to shift and open the port when the spool valves, or sectional valves, are actuated. In the system, sectional valves can slide back and forth and allow the fluid flow to advance in one direction or another around the piping set. Most of the directional control valves, including sectional valves, are 4/3-way valves. The term refers to the valves having 4 working parts and 3 spool positions to alter.
The essential parts of sectional control valves include relief valve, actuator, body, positioner, and filter.
The valve body of the sectional valves is the main part that retains the pressure, houses other important components of the valves, and connects all the piping which is the passage for fluids. Ends of the body of the sectional valves can be different types, including flanged, thread, and butt welding. The materials that the valve bodies are usually made of are cast steel, stainless steel, and alloy steel.
The actuator is the controller for operating every part of the sectional valves. As above-mentioned, sectional valves can be manually operated or power-operated by a manual actuator, pneumatic actuator, hydraulic actuator, or electric actuator.
The check valve that is located in the valve body is used to ensure the hydraulic oil will not flow back.
The pressure relief valve in the valve body can adjust the working pressure of the hydraulic system.
Filters should be installed in the hydraulic valves including sectional valves to reduce the target pollution level.
The use of high-quality and clean mineral-based hydraulic oils in the systems can ensure the sectional valves and the system achieve ideal performance.
Almost all hydraulic systems need directional control valves, and the sectional control valves are one of the most versatile and efficient types. Sectional valves have the capability to add or replace individual sections. The operator can cut the cost by adjusting the valve setups of sectional valves for custom production. The service of this type of control valve makes direction control much easier, which can also replace the function of a monoblock directional control valve.
Monoblock valves are more compact than sectional valves, they use a fixed and big pull rod to regulate the direction of fluid flow of the whole system. The entire structure of monoblock valves is one casting, which benefits the system since there are no sectional leak points in sectional valves that might cause installation or processing problems. However, when a problem occurs in one section, the whole monoblock valve must be removed for repair or adjustment.
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