Rapid gas decompression-resistant gate valve seals use specially processed HNBR and AFLAS compounds tested to NORSOK M-710. They prevent blistering and cracking when pressure drops from 15,000 psi to atmospheric in minutes during emergency shutdowns and well testing operations. https://globalsealstech.com/product-category/oil-gas-seals/api-6a-gate-valve-seals/