PU220 Series Valve
The Shako PU220 series 2 way Brass solenoid valve is an assisted lift electrically actuated valve for the ON/OFF control of fluids and gaseous media that are compatible with the materials of construction. Sometimes referred to as a direct acting, hung diaphragm, kick pilot or zero-rated valve, the PU220 valve is designed to physically lift the diaphragm and utilise any pressure differential between inlet and outlet to assist the opening or closing of the valve.
The PU220A is a 2/2-way (2 port / 2 positions) normally closed solenoid valve designed to stay closed until electrical power is applied. When power is applied the coil is magnetised which in turn lifts the armature and diaphragm revealing a small pilot hole in the centre of the diaphragm that allows the pressure above the diaphragm to vent out downstream so that the combined force of the spring lift and inlet pressure will fully lift the diaphragm into the open position allowing full flow through the valve. When the power is removed, the armature and diaphragm drop back down sealing the pilot hole, pressure increases above the diaphragm and the valve fully closes again within 20 to 50 milliseconds.
The NOPU220) (or PU220AN) is a 2/2 way normally open valve will stay open until electrical power is applied, at which point the armature lowers the diaphragm to seal, covers the internal pilot causing any inlet pressure to further assist the diaphragm into the closed position and the valve is then fully closed.
Pressure: Pressure range is from vacuum to 8.5 or 12 Bar according to coil power level.
Diaphragm materials: NBR rubber is standard, with options for FKM, EPDM or HNBR.
Solenoid coils: Standard coil is a 15 watt IP65 Class H CE DIN43650A 100% duty rated Nass Magnet System 13/30 coil voltages from 12vDC through to 380vAC, optional ATEX EExmIIT4 for hazardous area zones 21 and 22 voltages from 12vDC to 240vAC.
Materials of construction: Body Forged Brass SS41, Tube and internal parts Stainless Steel.
Ambient temperature range: -20C to +60C (according to solenoid coil)
Media temperature range: -40C to +160C (according to seal material)
Compatible media: Is based according to the materials of construction and diaphragm chosen, typically the PU220 valve is referred to as a General Purpose Solenoid valve, in that it is typically used for Vacuum, Suction, Compressed Air, Inert Gases, non-aggressive or corrosive liquids such as water, glycol, diesel and other light oils under 50 Centistokes viscosity. More information about chemical and material suitability can be found here.
Port Thread: PU220A is G (BSP) parallel thread, optional PU220N NPT thread, PU220F4 PN16 flange, PU220F3 ANSI150Lb flange or PU220F JIS10K flange.
PDF data sheet for PU220A Shako solenoid valve