Parker 903406P Valve

The Parker 903406P is a professional-grade Sporlan ADRSE-2 discharge bypass valve designed for precise compressor capacity control in commercial refrigeration and air conditioning systems. This direct-acting bypass regulating valve features a 0/80# pressure range and 1/2" ODF solder connections, making it an essential component for maintaining minimum evaporator pressure during low-load conditions. Built with a rugged brass body and a stainless steel diaphragm, the Parker ADRSE-2 utilizes an externally equalized design via a 1/4" ODF equalizer to respond accurately to downstream suction pressure changes, effectively preventing coil icing and short-cycling without the need for complex cylinder unloaders.

Key Benefits for HVACR Contractors:

• Precision Pressure Management: The 0 to 80 PSIG adjustment range allows technicians to fine-tune the hot gas bypass to match specific system requirements.
• Superior Construction: Features copper connections and a knife-edge metal-to-metal valve joint for a permanent, leak-proof seal under high-vibration conditions.
• Optimized System Longevity: Helps maintain refrigerant flow and prevents the compressor from operating below designed suction pressures, reducing mechanical stress.
• Flexible Installation: The 1/2" ODF sweat connections and compact Type ADRS body style allow for integration into various piping configurations, including evaporator inlet or suction line bypass.

Common Questions & Technical Insights:

When should the ADRSE-2 be used instead of an internally equalized valve?
An externally equalized bypass valve like the 903406P is required when there is a significant pressure drop through the evaporator or when bypassing hot gas into the suction line, ensuring the valve senses the true evaporator pressure for accurate modulation.

Is a solenoid valve required for system pump-down?
Yes, since the ADRSE-2 is a modulating valve that opens on a drop in pressure, a hot gas solenoid valve must be installed upstream if the system requires a positive pump-down cycle to stop flow during the off-cycle.

What is the maximum working pressure for this valve?
This Sporlan bypass valve is rated for a maximum working pressure (MWP) of 500 psi, making it compatible with most standard HCFC and HFC refrigerants used in modern HVACR systems.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.