维修第一和第二止回阀
Servicing the First and Second Check Valves

　　注意：维修之前要确保水路已经关闭，或者关闭阀已经关闭。
　　NOTE: Before servicing be certain water is turned off or shut-off valves are closed

1. 拆卸阀盖后，再拆卸阀体镗孔保持器。然后用手或螺丝刀从阀门上拆卸止回阀模块。
   After removing the cover, remove the retainer for the body bore. The check valve modules can now be removed from the valve by hand or with a screwdriver.

　　注意：系列007通径DN15 - DN50的第一和第二止回模块的阀座和弹簧是不可互换的。第一止回模块的弹簧较大而阀座直径较小。系列007M1通径DN20 - DN25和系列007M2通径DN20配置可互换阀座和弹簧。
　　Note: For Series 007 sizes ¹/₂" - 2", the seats and springs of the first and second check modules are not interchangeable. The heavier spring and smaller diameter seat belong with the first check module. Series 007M1 sizes ³/₄" - 1" and Series 007M2 ³/₄" have interchangeable seats and springs.

2. 止回笼上的止回阀座配置一个卡口型锁定装置。用一只手握住止回笼，向内推阀座，面对止回笼顺时针方向旋转，对于系列007M2，拉开阀座和止回笼。此时，阀座，止回笼，弹簧和阀瓣总成就分解成都里的部件。
   The check seats are attached to the cage with a bayonet type locking arrangement. Holding the cage in one hand, push the seat inward and rotate clockwise against the cage, for ³/₄" Series 007M2 pull apart seat and cage. The seat, cage, spring and disc assembly are now individual components.
3. 根据阀瓣的新旧程度，现在可能要对阀瓣进行清洗或重新组装，也可能要报废，并用维修组件中新的阀瓣更换组装。O形环应该进行清洗，如果必要的话，要进行更换。
   The disc assembly may now be cleaned and reassembled or, depending on its condition, it may be discarded and replace with a new assembly from the repair kit. O-rings should be cleaned or replaced as necessary.
4. 按照与拆卸相反的操作程序重新组装止回阀模块。安装在阀门内的止回模块其阀座应该面对阀门进口。在安置保持器之前，要确保模块已经正确定位。在通径DN20 - DN25的产品上，保持器可能需要稍微倾斜才能安置。重新安装阀盖。
   Reassemble the check valve module in the reverse order. Check modules are installed in the valve body with the seats facing the valve inlet. The modules must be securely in place before the retainer can be replaced. On the ³/₄" - 1" size, this retainer may have to be tilted slightly into place. Replace cover.

DN15 - DN50更换配件
¹/₂" - 2" Replacement Parts