Valve Stem Packing

PTFE gland packing is a sealing material made from polytetrafluoroethylene, used in the stuffing box of valves and pumps to prevent fluid leakage around a moving stem or shaft. It offers excellent chemical resistance, low friction, and a wide operating temperature range, making it suitable for demanding oil and gas and industrial fluid-handling applications.

PTFE (polytetrafluoroethylene) is a fluoropolymer used in valves for seats, seals, and stem packing due to its chemical inertness, low coefficient of friction, and resistance to a wide range of process fluids. Its non-stick, self-lubricating properties reduce wear on moving parts and help maintain a reliable seal over repeated valve cycles.

Valve stem packing is typically supplied in braided rope or ring form, sized to match the stem diameter and stuffing box dimensions of the specific valve. Common cross-sections range from small fractional-inch sizes for instrument valves up to larger dimensions for heavy industrial and pipeline valves. Contact our team to confirm sizing for your application.

Replacement frequency depends on operating conditions such as temperature, pressure, media, and cycling frequency, but packing should be inspected regularly for signs of leakage, hardening, or wear. Many industrial operators replace packing during scheduled valve maintenance or immediately upon detecting stem leakage to prevent fugitive emissions and equipment damage.

PTFE valve stem packing generally performs reliably across a broad temperature range, commonly from sub-zero conditions up to around 500°F, depending on the specific formulation and application. This wide range makes it suitable for many oil and gas, drilling, and industrial process valves that experience fluctuating thermal conditions.

Yes, PTFE is highly chemically inert and resists attack from most acids, bases, solvents, and hydrocarbons encountered in oil and gas and industrial processing environments. This chemical resistance, combined with its low friction properties, makes PTFE packing a preferred choice for valves handling aggressive or corrosive media.