Rising Stem
A valve design where the stem moves upward as the valve opens, providing a visual indication of valve position. Standard on OS&Y gate valves. 'Non-rising stem' keeps the stem in place while a nut rises - used where headroom is limited.
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What is a Rising Stem in a valve?
A valve design where the stem moves upward as the valve opens, providing a visual indication of valve position. Standard on OS&Y gate valves. 'Non-rising stem' keeps the stem in place while a nut rises - used where headroom is limited.
What materials are used for the Rising Stem?
Rising Stem 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 Rising Stem?
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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