Wenzhou Carol Ball Valve Co.,Ltd: API 6D&6A ball valves, oilfield valves, oil path check valve. Over 20 years industrial valves for oilfield, gas, chemistry. API 6D & 6A& PED/97 and ISO9001 approved. We offer 2000#/3000#/6000# threaded end ball valves, thread end check valve, forged steel high pressure ball valves, flanged ball valves (floating and trunnion type), metal seat ball valves. Size: 1/2' to 42'. Pressure: 150LB to 2500LB'.