Thank you very much for your email. Re the Sherwood valve, I contacted the agent of Sherwood in China and was told that they are no longer to sell Sherwood valves due to long term delivery time and high price. I just contacted Sherwood USA and asked quotation of CGA320 valves. I will keep you updated the following and tried to quote you a price ASAP.
In the attachment please find the test reports and CE certificate issued by TUV. I hope that you will be happy to see it.
Ms. Chompoo, please no need to say sorry. It is my pleasure of offering our assistance and further if possible our products for you.