Hydraulic valves come in various types; it all depends on what type of system you are working with. A few common products are high frequency valves and low frequency valves.

 

High frequency valves

 

High frequency valves include various products its own. A cartridge valve - stage 2, or analog proportional pressure control valve, is a unit designed to modulate pressure from 0 to 30 bar. This is a two way stage unit that features high spool driving forces. With high spool forces, it is able to overcome heavy contamination and debris.

 

Manifolds, or pipe mounts, are another high frequency valve product that controls pressures from 100-5000 psig. It is a frictionless suspension armature that allows for longer life and fewer reliability problems due to contamination. Specifics are up to the designer and customer's preferences based on a given application.

 

A PTO valve is similar to the analog system, how it is a four-way pressure control. As command increases, the brake port is modulated proportionally and the clutch is propionate. Controlled by a single command, yet two separate functions.

 

Frictionless pilot valves are an electro-hydraulic unit designed for pressures 0 to 30 bar. It can be used in combination with other spools or pistons to provide proportionate pressure.

 

Low frequency valves

 

Direct drive valves are directly coupled to the valve spool. It is driven solely by force produced from the armature. Direct valves are simpler than an analog 2-stage valve. There is no sluggish flow and they are generally smaller components. Direct drive valves include 2, 3, 4 and 5 way controls, on/off and proportional, flow control, and pressure control.

 

Another popular item in hydraulics is the mechanical solenoid. It is a lock out actuator used for many applications, such as locking out a gear lever. It is designed to handle high radial side loads to the pin. Think of a dead bolt locking a door; it works in a similar manner. Typically, mechanical solenoids are utilized in automotive, truck, off road construction and agriculture systems.