API Rotary Check Valve

National Standard Rotary Check Valve

In piping systems, mechanical equipment is protected by preventing backflow of media.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. 

Check Valves are installed in high pressure lines to stop reverse flow by the automatic close of flapper or dart.

We provides both standard and reverse-flow check valves. 

And we have also developed check valves for sour service in accordance with NACE MR0175.

Characteristics and features

▲The valve disc is closed quickly and the water hammer pressure is small;

▲The horizontal or vertical pipes can be used, and the installation is convenient;

▲The flow passage is unobstructed and the fluid resistance is small;

▲Sensitive action and good sealing performance;

▲The overall structure is simple, compact and beautiful;
▲Long service life.

Specifications and parameters

Nominal size: DN50 ~ DN600
Nominal pressure: PN16 ~ pn420
Design standard: GB / T 12236
Structure length: GB / T 12221
Connecting end: GB / T 9113, Hg / T 20592, GB / T 12224
Inspection standard: GB / T 26480
Applicable media: water, oil, gas, nitric acid, acetic acid, etc
Service temperature: - 29 ～ 593 ℃
Common materials: valve body: WCB, wc6, wc9, CF8, CF8M, CF3, cf3m, etc;
Sealing surface: 13Cr, STL, 304, 316, etc;
Shaft: 20cr13, f304, F316, etc.

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 6A and 16C standards and have been widely used on oilfield Wellhead Christmas Tree and manifolds with reliable performance.

Group Strength Advantages:

With registered capital RMB 84.76 million, covering 220,000 square meters, 76 workshops, 1058 Staffs, 950 sets of cold and heat machining equipment, 50 sets of numerically controlled equipment, ZYZJ O&G Group has consecutively established the strategic partnership with SINOPEC, CNPC, Zhongyuan Oil Field and Shengli Oil Field, and leveraged its technical and manufacturing advantages to provide satisfactory products and solution services to customers at home and abroad.

All products are manufactured under ISO9001, ISO14001,and comply with the requirements of API spec (acquired in 1999, including API 4F、5CT、7K、8C、11AX、11B、11E）

With professional teams experienced in the maintenance of drilling machinery,TDS,SCR equipment, we can undertake Pumping Unit oil well on-site management services.

Long-term supply accessories of Drilling Rigs, workover rigs, Mud Pump and beam pumping unit, and distribute drill pipe, drill collar, casing, tubing, special drill pipe sub etc.

We are major at Cementing and Fracturing Equipment, Gate Valve and wellhead Christmas Tree,Plunger Pumps and Mud Pumps, Flow line Products, Solid Control Equipment,Drilling Rigs and Work over Rigs Matching Equipment etc.

High quality & Steady quantity & Most competitive price will be sent for you.