2. Yoke Nut. Extra long thread engagement between yoke nut and stem provides long thread life. Force feed lubricant application is included.

3. Gland Eye Bolts Facilitate Packing Maintenance. For ease in repacking the valve, gland eye bolts are mounted to swing aside.

4. Extra Clearances Prevent Stem Scoring. Sufficient clearance between the gland, stem and stuffing box prevents scoring stem even if the gland is inserted unevenly.

5. Deep Stuffing Boxes. Depth is more than adequate in all sizes and pressures to assure tightness and maximum packing life. Packing sizes conform to API requirements for refinery service. In all cases bonnet back seats are furnished against which the stem head may be seated, thus relieving the pressure on the packing to facilitate repacking. Stuffing box packing is a reinforced, flexible graphite packing which remains flexible and resilient at high temperature, which permits ease in gland adjustment, and which contains a corrosion inhibitor for protection of the stem.

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6. Body-to-Bonnet Joint. A flat face gasket joint Is used In the Class 150 valve. A male and female or tongue and groove joint is used in the body - bonnet connection of the Class 300 and higher valves; this type of closure permits reassembly in the field without danger of misalignment.

7. Bodies of all valves give adequate bolt clearance for end flange bolting and for nuts between body neck and back of end flange. On Class 300 and higher valves, body-bonnet flanges are made circular for greatest strength and for minimum distortion.

8. Ports are Streamlined. Permits unobstructed flow which reduces turbulence resulting in minimum pressure drop and lowers erosion.

9. Integral Guide Rib Faces Assure Self-Centering of Wedge. All wedges of I-beam cross section for greater strength. Long guide slots in wedges making centering of wedges certain at all times. The wedge has integrally forged or cast heavy hooks to provide a substantial connection for the tee-head stem while allowing the wedge to center itself.

10. Seat Rings Designed to Eliminate Turbulence. Erosion and Pressure Drop. Cylindrical bottom-seated type having ample cross-section (for strength) are inserted so that no recess exists at the back of the ring. Seat ring and machined portion of body are finished accurately to gage.

All Walworth Cast Steel Gate Valves can be furnished with either flanged ends or butt welding ends.

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