一、前言弹簧全启式安全阀是目前使用最广泛的一种超压保护装置。它具有结构简单、动作可靠等优点。然而,安全阀在工作状态下,其弹簧的向下作用力仅稍大于介质的向上作用力。因此,要保证安全阀的可靠密封需要采取一系列的措施。通过减小密封面宽度来增大密封比压是主要措施之一。然而,减少密封面宽度需要考虑几个问题:(1)无内压时密封面的接触应 First, the foreword Spring-type safety valve is the most widely used over-voltage protection device. It has the advantages of simple structure, reliable action and so on. However, the safety valve in the working state, the downward force of the spring is only slightly larger than the media upward force. Therefore, to ensure a reliable seal safety valve needs to take a series of measures. Increasing the seal pressure ratio by reducing the width of the sealing surface is one of the main measures. However, there are several issues to consider when reducing the width of the seal face: (1) The contact of the seal face without internal pressure should