The main casing of an electric hydraulic valve is the outside enclosure that protects and houses the inner components, including the bonnet, seat and disc. The bonnet is a section of the casing that can be removed for service, the seat is where the valve connects to the hose or pipe and the disc is a seal that helps keep the seat watertight.
Hydraulic valves can vary in their specifications; the size ranges from about one to twelve inches; the average valve is around three inches long. Electric valves are computer controlled and do not require an operator. Because they can be remotely controlled and operated, electric hydraulic valves are often found in places where manual operation would be difficult such as in underground piping.
Electric hydraulic valves are found in fluid control systems because they are a simple way to manage pressure and fluid levels. They serve as power switches for some hydraulic tools. Non-electric hydraulic valves do not use electricity to function but are manually operated by turning or flipping a handle.
Some valves called check valves only allow fluid to pass through them in one direction, which prevents backwash and the resulting contamination. Some control valves have sensors that automatically close the valve if the flow or pressure is too high while others send electrical impulses down the line to systematically slow the fluid and shut it off.
Electric hydraulic valves may also refer to valves that are present in systems with electric motors. Electric motors or pumps generally use the method of positive displacement to create enough power to force liquid through the system. The size and shape of the pipes and tubes also help create power and pressure. Electric-controlled valves such as solenoid valves offer faster response times, increased stability and less loss of fluid.
They are manufactured through computer controlled numeric (CNC) machining that is managed by software programs. This kind of production minimizes the possibility of human error and produces very precise parts. They can also be cast or forged; plastic valves are made through injection molding or through extrusion.
To cut down on expenses, these valves are usually long and narrow, which also increases the pressure of the system. Sometimes a larger end is connected to a valve in order to make the valve capacity of connecting to a larger line.