1. Wellhead and surface self-cutoff safety valve is used for our company's valve and also for other API standard products. Which has single piston structure, reduce needed hydraulic liquid, large high pressure spring to guarantee close valve quickly. 2. As customer's requirement, we provided rising stem or non-rising stem wellhead and surface self-cutoff safety valve. Which has a down ring circle into bonnet to predigest assembly and remove abrasion. Two display having supervisory control to gate valve, discharge valve guarantee clean actuating cavity. 3. It is convenience for installation which meet with API standard, so working pressure up to 15000psi.
