How to Assemble a Globe Valve

The globe valve was invented around the same time as the steam engine, which needed valves for better control and reliability. The globe valve's design is quite simple and uses a minimum number of components.

Things You'll Need

• Wrenches
• Handwheel
• Stem
• Bonnet
• Valve body
• O rings
• Packing material
• Cap nut
• Seat disc
• Seat disc retainer

Instructions

1. Thread the stem through the bonnet, being certain to insert proper packing and O rings to insure an effective seal.

2. Assemble the seat and seat disc retainer. The rubber seat should fit neatly onto the disc retainer. Attach the seat disc / retainer to the lower end of the stem. The seat disc is self-aligning and will fit over the knob-shaped end of the stem. Be sure the proper O ring is inserted in the stem around the knob portion before attaching the seat disc / retainer.

3. Attach the handwheel to the top of the stem. The handwheel is held in place by a cap nut that must be tightened to insure smooth operation.

4. Insert the synthetic rubber seat in the body of the valve. The seat should snap into place and will align with the seat disc when the valve is fully closed.

5. Thread the entire bonnet assembly into the body of the valve. Tighten the bonnet until it is snug against the body portion of the valve.

Tips & Warnings

• Depending on the model of valve you are assembling, the bonnet may be bolted rather than screwed into place. If it is bolted, be sure all gaskets are in place and properly secured.

• Make sure the valve is fully open before beginning step 5. If the valve is closed, the seat will bottom out before the bonnet is fully secured.