The Basic Functions of the Series EVR Electric

Valve Actuator

The Series EVR Electric Valve Actuator is a rugged, simple design that is ideal for on/off applications. Its simple design eliminates the need for additional control features. This valve is available in a variety of sizes to meet a variety of needs. It is also available with a range of safety features. This article covers the basic functions of the Series EVR Electric Valve Actuator. Its main features include:

Activation of armature 46

The evr valve can be opened and closed by manipulating an armature. The armature has a primary lower surface 23 that engages the upper end of the first pintle valve 62. It also has a retainer cap 66 on the stem. The armature can only fully open a valve against a biasing spring if its magnetic force is sufficiently strong.

In an evr valve, the armature of the solenoid engages a smaller second valve during the first stage of the valve’s stroke. The smaller valve maintains a low flow range. Because the intake and exhaust pressures are very low, the force applied by the second valve is relatively low compared to the force applied to open the first valve.

Vacuum signal generated by solenoid assembly 24

Vacuum control valves often use a solenoid to control fluid flow in a motor vehicle. The solenoid has a coil assembly with many turns of copper wire wound around it. This coil is then mounted to a metal frame, providing low magnetic path resistance. It also includes a flexible diaphragm that controls fluid pressure.

Solenoid valves have very low temperatures since the solenoid coil generates heat when it is energized. Standard solenoid valves are typically designed to have a maximum temperature rise of 130degF or less, and a maximum ambient temperature of 144degF. However, these valves can produce high-decibel audible noise when actuated. The noise that these valves generate can cause annoyance for the occupants of the vehicle.

Flow restriction caused by damping ring 110

The damping chamber 106 is located intermediate EVR chamber 82 and reference chamber 108 and operates to dampen fluctuations of the vacuum signal. It also functions to separate EVR chamber 82 from reference chamber 108, thereby establishing a balanced vacuum in the control chamber 90. This allows the valve to maintain a desired operating pressure and prevent oscillation. A reference chamber 108 has a circular inner wall portion 116.

The ECU 22 supplies a sawtooth waveform at 100 Hz to control the solenoid assembly 24 of the EVR valve 12. In an open position, the valve assembly 92 oscillates in response to the vacuum signal. The damping chamber 106 has a larger volume than the EVR chamber 82.