Packing (Stem Packing)
Sealing material compressed around the valve stem in the stuffing box to prevent leakage to atmosphere. Common types: PTFE (clean service, to 200 degrees C), graphite (fire-safe, high-temperature, low-emission), and proprietary spiral-wound graphite for ISO 15848 Class A compliance.
Related Terms
Applicable Standards
Industrial Valves - Measurement, Test and Qualification Procedures for Fugitive Emissions - Part 1
ISO 15848-1 specifies measurement, test, and qualification procedures for fugitive emissions from industrial valves.
API 622 - Type Testing of Process Valve Packing for Fugitive Emissions
API 622 specifies type testing requirements for compression packing used in gate, globe, and other rising-stem valves to qualify packing sets for fugitive emissions service - complementing API 641 for ball valve stem seals.
Frequently Asked Questions
What is a Packing (Stem Packing) in a valve?
Sealing material compressed around the valve stem in the stuffing box to prevent leakage to atmosphere. Common types: PTFE (clean service, to 200 degrees C), graphite (fire-safe, high-temperature, low-emission), and proprietary spiral-wound graphite for ISO 15848 Class A compliance.
What materials are used for the Packing (Stem Packing)?
Packing (Stem Packing) material selection depends on the process fluid, operating temperature and pressure, and required corrosion resistance. Standard materials include carbon steel (A216 WCB/A105), austenitic stainless steel (SS316/316L), and corrosion-resistant alloys (Hastelloy C-276, Inconel 625, duplex stainless steel 2205/2507) for aggressive service. All materials must be certified with EN 10204 Type 3.1 MTCs traceable to the heat number.
What standards govern the design of the Packing (Stem Packing)?
Valve component design is governed by ASME B16.34 for pressure-temperature ratings, API 600/602 for gate valves, API 609 for butterfly valves, and API 6D for pipeline valves, as applicable. Third-party inspection to these standards ensures compliance. Vajra Industrial Solutions supplies valves with full documentation packages including dimensional inspection records and material certificates.
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