FAQs - Solenoid Valves

A solenoid valve is an electromechanical valve for use with liquid or gas. The valve is controlled by an electric current through a solenoid coil.

• A valve is an electrical tap.
• It could have one inlet.
• It could have from 1 to 4 outlets
• Each inlet/outlet is called a "way"
• We talk then about 2 way valves, 3 way valves, 4 way… etc

The body is the main part of the solenoid valve with the ports, seats and orifice passages. In almost all Parker products the bodies are made of brass stampings, while other materials such as below are used in some special versions.

• Stainless steel (303 – 304 – 316…)
• Aluminum
• Other

The coil can be different:

• Standard DIN Coil
• Standard wired connection coil
• ATEX coil

This acts as a stop for the moveable plunger (=MP) and it is used to shield the magnetic flow. (Usually made of magnetic stainless steel).

NBR (nitrile butadene rubber)
Synthetic elastomer of standard quality for neutral fluids, such as air, water and oils with working temperatures from -10°C to +90°C.

CR (chloroprene)
Synthetic elastomer particularly suitable for water, mineral oils, refrigerants, with working temperatures from -30°C to +90°C.

EPDM (ethylene propylene)
Synthetic elastomer suitable for hot water and steam with working temperatures from -10°C to +140°C.

FKM (Viton)
Fluorinated elastomer suitable for oils, fuel gases, petrols and solvents. Working temperatures from -10°C to +140°C.

Ruby
Synthetic corundum (hard stone) with high hardness values and total inertia for all types of fluids. Working temperatures from -40°C to +180°C.

PTFE (Teflon)
Plastic material without springback and inert to most fluids, including refrigerants. Working temperatures from -40°C to +180°C. In the case of “Teflon diaphragm ”, this refers to a glass fiber fabric between two layers of PTFE.

PTFE with filler (Rulon)
Plastic material with coloured mineral fillers, without springback, inert to most fluids, including refrigerants. Working temperature from -40°C to +180°C. More resistant than virgin PTFE to compression and wear.

Water hammer (or, more generally, fluid hammer) is a pressure surge or wave resulting when a fluid in motion is forced to stop. This commonly occurs when a valve is closed suddenly at an end of a pipeline system, and a pressure wave propagates in the pipe. It may also be known as hydraulic shock. This pressure wave can cause major problems, from noise and vibration to pipe collapse