PTFE gland packing is braided from pure PTFE fibers without any added lubricants or treatments involving PTFE emulsions or greases. Its solid braided structure offers flexibility and adjustability, ensuring an excellent fit with the shaft and stuffing box. It boasts superior corrosion resistance, good self-lubricating properties, and non-stick characteristics; it maintains its strength in high-temperature and humid environments and is easy to install and remove.
(1) Select the appropriate PTFE packing and use a cutting machine to precisely cut the required length for the packing ring; if a specialized cutting machine is unavailable, you can calculate the length using a formula. Generally, a 90° straight cut is used for rotating shafts, while a 45° cut is used for valves. Do not determine the length by wrapping the packing directly around the stuffing box or a pipe identical in diameter to the valve stem while pressing it tightly, as this can cause the packing to stretch.
(2) Next, cut a sample ring to verify that it fills the space correctly and ensures there are no gaps at the joint. This sample ring can then serve as a standard for cutting the remaining packing rings. If the packing is soft or prone to deformation, you can create a small strip based on the sample ring and use that strip as a guide to cut the rest of the packing rings.
