All the valves are certified by: ISO9001, API6D, CE, ISO14001, TS etc, We do OEM production with high quality and good price. Our valves are tested before shipment to make sure every valve is no leakage. That¡¯s why our products sell well in the world with a good reputation. If you have any interest, please let us know. We are looking forward to your reply. Thanks in advance.