由于弹簧材料钢性大不能用不锈钢球阀等防腐材料制作，产品防腐能力差，阀门的使用寿命不长。
As the largest steel spring material such as stainless steel anti-corrosion materials can not be produced, poor corrosion products, the life of the valve is not long.
由于在球阀下边设有弹簧，使球阀具有自密性，保证球阀的密封性更加可靠，提高作业的可行性。
As the spring is arranged below the ball valve, the ball valve has self-tightness, thereby ensuring the tightness of the ball valve to be more reliable, and improving the feasibility of the operation.
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