Conventional Changeover Valve with Two Safety Valves
Key Specifications / Features
Detail Information
Temperature ratings up to 600 degrees C.
Suitable for pressure rating of class 2500.
Low leakage to atmosphere.
Cleaning in service through flushing port.
Actuation by hand, pneumatic, or electrical.
Can be partially or fully jacketed.
Can be combined with Multiport valves.
High level of customize is available.
Design: ASME, API 526, GB/T 12243-2005.
Material: A216 WCB, A351 CF8M, A216 WCC, A217 WC6, A217 WC9 or Stainless Steel and Special Alloys (904L, Hastelloy, etc.).
Pressure Grade: Class 150 LB, 300 LB, 600 LB, 900 LB, PN16 - PN100.
Sizes Range: DN20 x DN32 up to DN150 x DN250.
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FAQs
Low-emission packing systems are specifically engineered to minimize microscopic leakage along the valve stem, which is a common source of fugitive emissions in industrial plants.
Compared with conventional packing, low-emission designs achieve better performance through:
Higher material density control to reduce permeation paths
Pre-compressed or die-formed graphite rings for stable sealing stress
Optimized load distribution using live-loading spring systems
Improved surface finish compatibility with stem materials
These design improvements allow the packing to maintain consistent sealing force even under thermal cycling and vibration. As a result, leakage levels can be reduced to extremely low thresholds (often measured in parts per million), supporting compliance with environmental regulations and reducing operational losses.
