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Ball Valve: Floating PTFE Seat and Seal Rings on a Stainless Ball (Clade 1956)
A ball with a hole through it, turned a quarter turn, opens or shuts a pipe. Clade's valve seals it with PTFE. A seating ring rests on the ball, and behind it sits a flat PTFE ring twisted into a cone. PTFE remembers its shape, so the ring keeps pressing on the ball, and line pressure only presses it harder. The metal never touches the ball, so body and ball can be stainless steel.
Source: R. Clade (W-K-M Manufacturing), US 2,762,601 (1956). Unknown: the dimensions. The patent gives the design and a 45° seat angle, but no sizes, so they are linked to an unknown head. Stainless rod as stock and the machining tools are ours. Picture: the patent's sheet 1.
Expert
3 days
Consignes
1
1
Make the two-part body
Make the two-part body
Turn the cup: a base threaded inside for the pipe, an enlarged cavity with small bosses that lightly support the ball, a boss on top bored and threaded for the stem, and the mouth threaded inside for the closure, with a shoulder below the threads. Turn the closure: threaded outside to screw into the cup, threaded inside for the other pipe. Bore a through passage in both. Unknown: all the dimensions.
Matériaux pour cette étape :
Tige en acier inoxydable1 as requiredOutils nécessaires :
Tour à métaux
Jeu d'outils de tournage (HSS)
Barre d'alésage
Jeu de tarauds et filières
Pied à coulisse
Dimensions inconnues2
2
Cut the 45° seats and their V grooves
Cut the 45° seats and their V grooves
On the closure and on the ledge inside the cup next to the base, machine a conical seat at about 45° to the passage axis, so it would touch the ball at 45°. Interrupt each seat with a groove of truncated V section: its outer wall parallel to the axis, its inner wall parallel to the 45° line, its bottom square to the axis.
Outils nécessaires :
Tour à métauxJeu d'outils de tournage (HSS)Pied à coulisseDimensions inconnues3
3
Make the ball and the stem
Make the ball and the stem
Turn the ball as a true sphere and bore a passage through it. Round off the edges where the passage meets the surface, so they do not cut the rings. Mill a slot across the top for the stem. Turn the stem with a square operating end, a thread below it for the boss, a shoulder, and a lower end that fits the ball's slot.
Matériaux pour cette étape :
Tige en acier inoxydable1 as requiredOutils nécessaires :
Tour à métauxJeu d'outils de tournage (HSS)
Fraiseuse
Jeu de limesDimensions inconnues4
4
Make the PTFE rings
Make the PTFE rings
For each seat, cut a seating ring with a face parallel to the 45° seat and a sliding fit in the groove. Then cut a sealing ring, flat and rectangular in section (or cut from PTFE tube). For the stem, cut a ring of parallelogram section. Ours: all cut from PTFE ring stock.
Matériaux pour cette étape :
Anneau en PTFE5 piècesOutils nécessaires :
Tour à métauxJeu d'outils de tournage (HSS)Dimensions inconnues5
5
Fit the rings and assemble the valve
Fit the rings and assemble the valve
Put each sealing ring into its V groove first, twisting the flat ring into a cone, then slide in the seating ring. The ball closes the gap left behind the seal ring, and PTFE's memory keeps the seal's corner pressed on the ball. Set the ball in the cup and screw the closure in hard against the shoulder. Drill and tap the cup for a locking stud that enters a hole drilled in the closure. Fit the stem with its PTFE ring between the stem and boss shoulders, and screw it down: the ring is squeezed into a seal. Drop the stop cap over the stem and lock it with a stud. Its projection meets the body stops, so the ball turns only 90°.
Outils nécessaires :
Perceuse à colonneJeu de tarauds et filières
Clé à tube
Étau d'établi
Lunettes de sécuritéMatériaux
2- 1 as requiredEspace réservé
- 5 piècesEspace réservé
Outils requis
12- Espace réservé
- Espace réservé
- Espace réservé
- Espace réservé
- Espace réservé
- Espace réservé
- Espace réservé
- Espace réservé
- Espace réservé
- Espace réservé
- Espace réservé
- Espace réservé
Ce plan fabrique
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