Ingersoll Rand Screw Compressor Blow Down Valve with Solenoid (1SV / 2SV / 3SV Type) Product Description The Blow Down Valve with Solenoid Valve used in Ingersoll Rand rotary screw air compressors is an essential unloading and pressure-release component. Depending on compressor model, capacity, and control system, Ingersoll Rand uses 1SV, 2SV, or 3SV solenoid valve configurations to control blowdown and unloading operations. This valve system safely releases trapped air pressure during unload or shutdown, ensuring smooth restarts, reduced motor load, and long compressor life. Solenoid Valve Types Used in Ingersoll Rand Compressors 1SV (Single Solenoid Valve System) Single solenoid controls the blowdown function directly Used in small to medium HP screw compressors Simple and reliable unloading system Common in basic or older fixed-speed models Also known as: Single SV Blowdown Valve, Direct Acting Blowdown Solenoid 2SV (Dual Solenoid Valve System) Two solenoid valves used for unloading + blowdown control One solenoid manages inlet/unloader, second handles pressure release Better control during load / unload cycles Common in medium HP compressors and standard industrial applications Also known as: 2SV Blowdown System, Dual Solenoid Unloader Valve 3SV (Triple Solenoid Valve System) Three solenoid valves work together for precise pressure and unloading control Used in advanced control systems and Intellisys-based compressors Improves energy efficiency and operational stability Common in higher HP or controller-based IR screw compressors Also known as: 3SV Unloading System, Multi-Solenoid Blowdown Valve Assembly Key Functions Releases internal air pressure during unload or stop condition Assists in compressor unloading and smooth motor start Prevents back pressure on airend and separator Reduces electrical and mechanical stress Improves overall compressor efficiency and safety Technical Variations Solenoid coil options: 24V DC / 110V AC / 230V AC Normally Open / Pilot Operated configurations Different port sizes and mounting styles (model dependent) Compatible Ingersoll Rand Compressor Series UP Series EP Series SSR / RS Series R-Series IRN / Intellisys controlled models Why Buy from Royal Air Component ✔ High-quality compressor spare parts ✔ Suitable for OEM replacement and service use ✔ Expert guidance for correct 1SV / 2SV / 3SV selection ✔ Trusted supplier for Ingersoll Rand compressor spares