Header rings in well service pump packing act as the primary pressure barrier at the fluid end. Typically made from harder materials like bronze-filled PTFE or PEEK, they resist extrusion and absorb initial pressure spikes. Their precise fit distributes load evenly to the sealing rings below, protecting softer components from direct exposure to high-pressure proppant-laden fluids duri... https://globalsealstech.com/product-category/oil-gas-seals/high-pressure-water-pump-seals/