HTC provide High Vacuum and Ultra High Vacuum gate valve series.HTC gate valve be used with cryo-pumps, turbo molecular pumps or in any applications requiring clean, high life cycle, low maintenance. Gate valve body:stainless steel 304 -- UHV gate valve(with Bellows) -- UHV gate valve(without Bellows) -- HV gate valve(with Bellows) -- HV gate valve(without Bellows)