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This web page cv1807.blogspot.com states the following, "Sliding-Stem Control Valve Terminology 3." We saw that the webpage said " Top and bottom bushings that provide a means of sealing the yoke,to adjust the spring compression." It also said " A plate to hold the spring in position and to provide a flat surface for the spring adjustor to contact. The ned produced on the valve stem by the fluid pressure acting on the closure member and stem with the fluid at rest and with stated pressure condition. C Two way valve bodies having two."