China API 6A Valves Check valve is designed and produced entirely according to the requirements of API 6A 銆?em>Equipment Specifications for Wellhead and Christmas Tree銆? able to be used interchangeably with corollary equipment at home and abroad that is in line with API 6A Standard. The valve trim adopt sulfide-resistance steel and able to be used in H2S condition, valve body made by alloy steel forging with good performance. Two types of Check valves are offered by JIELIN: Swing type check valve and Lift type check valve. API 6A Check Valve, also referred to non-return valve, or one-way valve, is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction. An important concept in check valves is the cracking pressure which is the minimum upstream pressure at which the valve will operate. The Check Valve can be used with oil, gas, water, or drilling fluids and are available in all temperature and material classes. We can produce both swing type check valve and lift type check valve. Available in bore sizes from 1-13/16" to 7-1/16" and pressure ratings from 2,000 to 15,000 PSI. The standard material is forged AISI4130 alloy. All of our Check Valves are fully designed, manufactured, and tested as per API 6A and API 16C standards and have been widely used on oilfield wellhead christmas tree and manifolds with reliable performance. Features:锛?/strong> Working Pressure: 2000~20000psi Inside Nominal Dimension: 1 13/16鈥潂 7 1/16鈥?/p> Working Temperature: P-U Product Specification Levels : PSL1~ 4 Performance Requirement: PR1 Material Class: AA~ FF Working Medium: oil, natural gas,etc.China API 6A Valves website:http://www.jelinoilfield.com/api-6a-valves/