Products Description
| Product Name | Trane VAL08781 Main Oil Circuit Solenoid Valve |
| Model | VAL08781 |
| Applicable Industries | Construction and Commercial |
| Application | Refrigeration compressor |
| Packaging | Cardboard Box |
| MOQ | 1 Piece |
Trane VAL08781 Solenoid Valve: Core Functions
1. Control of Main Oil Circuit Flow (Primary Function)
Upon Unit Start-up: Coil energizes → Valve spool lifts → Valve opens → Lubricant pump supplies oil to the compressor bearings and rotors, establishing lubrication and hydraulic balance to ensure wear-free, high-speed operation of the screw compressor.
Upon Unit Shut-down: Coil de-energizes → Spring returns spool to original position → Valve closes → Main oil circuit is cut off, preventing oil backflow from the compressor into the oil reservoir or refrigerant system, thereby avoiding oil starvation (dry running) during subsequent start-ups and preventing refrigerant dilution of the lubricant.
2. Prevention of Oil Migration and Refrigerant Dilution
During shut-down, the oil circuit is strictly sealed off to prevent liquid refrigerant from dissolving into the compressor oil; this averts issues such as oil foaming, lubrication failure, and bearing burnout during the next start-up cycle.
3. Safety Interlock Protection
Interlocked with the unit’s oil differential pressure switch and oil pump operation signal: If the solenoid valve fails to open, the unit is inhibited from starting; in the event of an unexpected power failure during operation, the oil supply is immediately cut off and the unit shuts down to protect the compressor.
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Technical parameter
Company Profile
Technical parameter
| Q1:For refrigeration industry, which brands are your products covering? | A1:We produce filter element replacements for brands like,Bitzer, Carrier, York, McQuay, Trane, etc… |
| Q2:Does the price include freight? | A2:The quotation is usually the factory price. We can recommend the most economical logistics plan and calculate the freight according to your destination and quantity. |
| Q3:How to ensure product quality? | A3:We have a strict quality control process, and we will carry out multiple inspections before the products leave the factory to ensure that they meet the standards. |
| Q4:Why choose us? | A4:Product reliability: We are a professional manufacturer . can offer high-quality products at the most competitive prices. Technical support: We provide technical assistance. Industry experience: We have over 10 years of experience in the refrigeration equipment service field. After-sales service: We offer professional after-sales service. Team collaboration: We have a professional team that can provide you with prompt services and delivery schedules. |
Common Product Fault Symptoms
1. Coil Burnout (Failure to Actuate): The unit reports a “Low Oil Pressure Differential” alarm, and the compressor receives no oil supply; this is typically caused by coil overvoltage/aging, moisture-induced short circuits, or control circuit malfunctions.
2. Spool Seizing (Stuck Open / Stuck Closed):
Stuck Open: Oil continues to flow after the unit shuts down, leading to refrigerant dilution of the oil and an oil shortage upon startup.
Stuck Closed: No oil supply is delivered after startup, triggering an oil pressure differential alarm and causing the unit to shut down.
3. Causes: Primarily attributed to impurities in the oil clogging the spool, spring fatigue, or internal wear within the valve body.
Valve Body Leakage: Oil leaks at connections, a drop in oil level, or insufficient pressure; typically caused by cracks in weld joints, aging seals, or casting defects (pinholes) in the valve body.
4. Noise / Vibration: A buzzing or abnormal noise occurs when energized, accompanied by vibration of the valve body; this is typically caused by a loose coil, corrosion of the iron core, or insecure mounting/fastening.
