Valve ball and seat is one of key parts of subsurface sucker rod pump. Its performance directly affects the use effect and service life of sucker rod pump. Good quality will increase the oil production and reduce maintain times of pump to improve the oil well’s economic benefit.The ball and seat are

Valve ball and seat is one of key parts of subsurface sucker rod pump. Its performance directly affects the use effect and service life of sucker rod pump. Good quality will increase the oil production and reduce maintain times of pump to improve the oil well’s economic benefit.The ball and seat are

Valve ball and seat is one of key parts of subsurface sucker rod pump. Its performance directly affects the use effect and service life of sucker rod pump. Good quality will increase the oil production and reduce maintain times of pump to improve the oil well’s economic benefit.The ball and seat are