Product Description:
Parker 2-series O-rings are precision-molded elastomeric seals manufactured to AS568A dimensional standards. This specific range covers dash numbers 2-401 through 2-475, all featuring a uniform 0.275 inch (6.99 mm) cross-section. Inside diameters range from approximately 4.475 inches (113.67 mm) up to 25.940 inches (658.88 mm), making them ideal for large-diameter industrial sealing requirements.
These large-format O-rings are available in two primary elastomer families: NBR (Nitrile) for general-purpose petroleum and hydraulic service, and FKM (Fluoroelastomer) for aggressive chemicals and elevated temperatures. The 0.275-inch cord provides a robust compression set resistance, ensuring a reliable, leak-tight seal in high-pressure and large-gland applications.
Features:
AS568A 2-4XX Dimensional Compliance – Molded to standard dash-number tolerances for drop-in interchangeability.
Uniform 0.275 inch (6.99 mm) Cross-Section – Provides excellent extrusion resistance and structural stability for large-diameter sealing.
NBR (Nitrile) General Purpose – Excellent resistance to petroleum-based hydraulic fluids, oils, and fuels; typical temperature range approximately -34°C to +100°C (-30°F to +212°F).
FKM (Fluoroelastomer) Chemical Resistance – High resistance to aggressive chemicals, acids, and high-temperature fluids; standard service range approximately -25°C to +200°C (-13°F to +392°F).
Large Diameter Capability – Covers IDs up to 658.88 mm, reducing the need for spliced or custom-fabricated seals.
Precision-Molded Geometry – Provides uniform compression set resistance and reliable sealing integrity in large flanges and pressure vessels.
Technical Parameters:
| Cross-Section (mm) |
6.99 |
| Inside Diameter (mm) |
37.47 To 658.85 |
| Representative Parker Compound |
N0674-70 / N0552-90/V0747-75 / V0894-90 |
| Media (EPDM) |
Hot Water, Steam, Brake Fluids, Polar Solvents |
| Material |
NBR, FKM, EPDM, VWQ |
| Hardness |
70 / 75 / 90 |
This Pulse Valve Diaphragm is an essential component for QBY air diaphragm pump spare parts and QBY diaphragm pump applications, ensuring reliable performance and durability.
Applications:
Heavy-Duty Hydraulic Systems – Sealing large SAE straight thread ports and heavy machinery manifolds.
Large Pipe Flanges – Used on flanges, manways, and pressure vessel closures in chemical and petrochemical plants.
Oil & Gas Equipment – Wellhead equipment, large valves, and pipeline flanges.
Power Generation – Steam turbine casings and large cooling water systems.
Industrial Fluid Power – Large cylinders, accumulators, and heavy gearboxes.
Support and Services:
Our Pulse Valve Diaphragm is designed to deliver reliable performance and long service life in demanding industrial applications. For technical support, please ensure that you have the model number and specifications of your pulse valve diaphragm ready to help us assist you efficiently.
We offer comprehensive services including installation guidance, troubleshooting assistance, and maintenance tips to maximize the effectiveness of your pulse valve diaphragm. Our technical team is equipped to provide detailed information on compatibility, replacement intervals, and operational best practices.
In addition to support, we provide repair and replacement services to minimize downtime and maintain optimal system performance. Regular inspection and timely replacement of the diaphragm are recommended to prevent unexpected failures and ensure consistent pulse valve operation.
For detailed product manuals, installation videos, and FAQs, please refer to the resources available on our official website. Our support documentation is updated regularly to incorporate the latest industry standards and product enhancements.
Your satisfaction and uninterrupted operation are our top priorities. We are committed to delivering exceptional service and expert technical support for your Pulse Valve Diaphragm needs.
Packing and Shipping:
Each Pulse Valve Diaphragm is carefully packaged to ensure maximum protection during transit. The diaphragm is first placed in a protective plastic bag to prevent contamination and moisture exposure. It is then securely positioned within a custom-fit foam insert or molded tray to avoid any movement inside the box. The outer packaging consists of a sturdy cardboard box labeled with product details and handling instructions.
For shipping, we use reliable carriers to guarantee timely and safe delivery. Packages are handled with care, and tracking information is provided to customers for real-time monitoring. Bulk orders are palletized and shrink-wrapped to enhance stability and protection throughout the shipping process.
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