Jual Solenoid Valve JAKSA – Valve orifice is closed by a diaphragm or a piston. A bypass connects the chamber above the diaphragm/piston and valve outlet. Bypass is closed by a solenoid core and opens when coil is energized. When this occurs, the pressure above the diaphragm/piston drops and the flow through the valve is established.
This principle of operation requires pressure difference between the valve inlet and outlet and is therefore not applicable at pressures near 0 bar.
The choice of materials used in JAKSA solenoid valves depends on the type of fluid to be controlled.
Valve bodies
• machined brass (CuZn39Pb3), optionally nickelised
• thermoplasts (Polyamide or Polypropylene)
• stainless steel (AISI 303/1.4305, AISI 304/1.4301 or AISI 316L/1.4404)
Seals – diaphragms
The choice of sealing material depends on mechanical, thermal and chemical requirements. NBR is the standard material for use with neutral chemically fluids at temperatures up to 90°C. At higher temperatures, EPDM, FPM and PTFE can be used. In some cases (high temperature and high cycling rate) stainless steel can also be used.3
Characteristics of sealing materials:
NBR (Nitrile butadiene rubber)
• high mechanical durability
• resistant to oil and grease
• tight shut-off
• temperature range: -20°C (-40°C) to +90°C
• fluids: water, fuel, mineral oil, air, argon, town gas, methane, propane, buthane
EPDM (Ethylene propylene diene monomer rubber)
• resistant to acids and lyes of medium concentration
• non-resistant to oil
• tight shut-off
• temperature range: -30°C to +130°C
• fluids: hot water, wet steam, ozone, ethylene and methylene, alcohol, acids and lyes
FPM (Fluorinated propylene monomer)
• excellent chemical resistance
• mechanical durability lower than NBR or EPDM
• tight shut-off
• temperature range: -40°C to +200°C
• fluids: hot and oiled air, acids, lyes and other fluids that do not allow use of NBR or EPDM
PTFE (Polytetrafluoroethylene)
• resistant to almost all chemicals
• non-resilient, slight leakage on valve seat may be expected at low pressures
• temperature range: -200°C to +250°C
• fluids: various chemicals, refrigerants, ammonia, dry steam
PA (Polyamide, 30% glass-fiber reinforced)
• non-resilient, slight leakage on valve seat may be expected at low pressures
• good chemical resistance, particularly to fuels, lubricants, solvents and cleaning agents
• temperature range: -40°C to +160°C (+180°C short term)
PU (Polyurethane)
• not suitable for water and other liquids due to cavitation
• elastic material with hardness of 90 Sh A and tight shut-off
• temperature range: -60°C to +70°C
• fluids: air (dry or oiled), grease
PEEK (Polyether ether ketone)
• excellent hardness and wear resistance
• easily machinable, with excellent surface finish
• non-resilient, slight leakage on valve seat may be expected at low pressures
• temperature range: -50°C to +250°C
• fluids: mostly liquid