Combination Check Valves: Efficient and Versatile Flow Control
Product Number: V1735101VS
Combination check valves integrate an umbrella valve at the inlet with a duckbill valve at the outlet. In a system where a reciprocating pump moves fluids from an elevated reservoir to a lower delivery point, the elevated reservoir is connected to the umbrella inlet, while the duckbill outlet directs the flow to the delivery point. The umbrella valve prevents backflow when the pump is not operating. As a vent valve, it can be easily snapped into a flat plate for simple installation.
Materials of Construction
- Part Number: V1735101VS
- Product Group: Combo
- Material Number: VL129X207
- Material Type: Nitrile Butadiene Rubber (NBR)
- Material Color: Black
- Durometer: 48
- Media Resistance - Water: Good
- Media Resistance - Fuel: Good
- Media Resistance - Oil: Fair
- Tg (DSC): -30°C
- Tmax (Continuous): 100°C
Design Characteristics
Function
Large, general-purpose combination valve designed for higher flow rates. It features a lower umbrella cracking pressure, ensuring that flow does not occur below the specified design pressure.
- OD: 0.625in, 15.88mm
Working Principle
A combination check valve integrates an umbrella inlet valve and a duckbill outlet valve for precise flow control. The umbrella valve allows fluid entry at a set pressure and prevents backflow, while the duckbill valve enables forward flow and seals against reverse flow. Together, they ensure efficient one-way flow and backflow prevention
Mounting Instructions
Combination valves are secured to a plate by snapping them into place using an undercut in the rubber. The plate may include features to keep the umbrella inlet area separate from the duckbill outlet. For detailed design specifications, please contact Vernay to request a seat drawing.
Photo/Rendering
Technical Drawing
Performance Characteristics
Opening Pressure
Duckbill Side Diagram
Umbrella Side Diagram
Definition
Opening Pressure is the differential pressure required for the valve to achieve the specified flow threshold. As the flow threshold increases, the Opening Pressure will also increase. Conversely, lowering the flow threshold results in a decrease in Opening Pressure. Water test data is available upon request.
Reverse Leakage
Duckbill Side Diagram
Umbrella Side Diagram
Definition
Leakage, or reverse flow, is measured by gradually increasing the backpressure across the valve, starting from zero. Please note that the leakage graph uses a different scale compared to the flow graphs. Water test data is available upon request.
Forward Flow
Duckbill Side Diagram
Umbrella Side Diagram
Definition
Flow and differential pressure are measured simultaneously as the inlet pressure increases from zero. Once the maximum flow is reached, the pressure is gradually reduced back to zero, with flow and differential pressure measured throughout the process. The chart displays the minimum and maximum flow values recorded during tests of multiple samples at each pressure level. Water test data is available upon request.
Vernay Quality Policy
Vernay is committed to the highest level of quality and service to our customers. We focus on innovation and continuous improvement in all areas of our business and accomplish these goals through our quality management system. Maintain our existing quality certifications (ISO/IATF-16949, ISO 9001, and ISO 13485).