Sanitary full-bore ball valve with clamp ferrule ends for hygienic liquid lines in dairy, beverage and food processing. It is an on/off valve: the bore is either fully open or fully closed, and it is not intended for throttling.
Prices on request. Contact us for availability and quotations.
The valve shuts on a spherical ball carried between two seats. A quarter turn of the lever takes the bore from fully open to fully closed, and in the open position the bore matches the tube, so the line drains and can be cleaned in place without a step or a dead leg at the valve.
Both ends are clamp ferrules. The clamp connection is described by DIN 32676 in Series A, B and C and by the withdrawn ISO 2852, which fixes the flange angle at 20°, the gasket groove at 23° and the flange thickness at 2.85 mm. The clamp ring and the gasket are sized on the flange diameter and not on the bore, so ferrules for 25 mm, 33.7 mm and 38 mm tube all take the same 50.5 mm clamp and the same gasket. Permissible pressure for the connection falls with size, from 25 bar on tube up to 42.4 mm outside diameter to 10 bar at 219.1 mm.
ISO 2852 requires the wetted material to be an austenitic stainless steel selected from ISO 2604-1 and a finely finished product-contact surface below Ra 1.0 µm. Hygienic practice is AISI 316L (1.4404) for wetted parts with AISI 304 (1.4301) for the clamp ring and handle, finished to Ra 0.8 µm or better. Seats are normally PTFE, and it is the seat rather than the body that sets the temperature limit.
When ordering, state the size together with the clamp series, because the series are not interchangeable — Series A DN50 is 53 mm tube on a 64 mm flange while Series B DN50 is 60.3 mm tube on a 77.5 mm flange. State also the body grade, the seat and gasket materials and the internal surface finish. Choose the gasket for the product: EPDM is the dairy and CIP default but has no resistance to oils and fats, NBR suits fats and oils to about 95 °C, silicone covers wide temperature swings but not hot water or steam, and FKM or PTFE are for chemically aggressive duties.
| Valve Type | Two-way, quarter-turn ball valve for on/off duty; throttling on the ball erodes the seat and is not an intended service |
|---|---|
| Connection | Clamp ferrule to DIN 32676 Series A, B or C, or ISO 2852; the series must be stated — it is not implied by the size |
| Clamp and Gasket Sizing | Sized on the flange diameter, not the bore: 34, 50.5, 64, 77.5, 91, 106, 119, 130, 155, 183 and 233.5 mm. Tube of 25, 33.7 and 38 mm all takes the 50.5 mm clamp and gasket |
| Pressure Rating (Clamp Connection) | Set by the clamp connection and falls with size: 25 bar to 42.4 mm tube OD, 16 bar to 76.1 mm, 10 bar to 219.1 mm. The clamp and the gasket determine the figure — this rates the joint only. A sanitary ball valve's body and its PTFE seat are rated below the clamp joint, so obtain the valve's own pressure rating for the size ordered before specifying |
| Temperature Range (Clamp Connection) | −10 °C to +140 °C for the clamp connection with suitable clamp and seals; the elastomer actually fitted sets the working limit |
| Wetted Material | Austenitic stainless steel selected from ISO 2604-1. Specify the grade: AISI 316L (1.4404) for wetted parts, AISI 304 (1.4301) acceptable for nuts, clamp rings and handles |
| Surface Finish | Ra < 1.0 µm on finely finished product-contact surfaces; Ra ≤ 0.8 µm is the finish usually quoted for hygienic service |
| Gasket | Natural or synthetic rubber of 75-85 IRHD to ISO 48, compatible with the product and the cleaning fluids and imparting no odour or taste. EPDM, NBR, VMQ, FKM or PTFE to be specified |
| Applicable Hygiene Standard | 3-A 68-01 Ball-Type Valves for Milk and Milk Products is the applicable class for this type of equipment. The goods are not asserted to carry the 3-A Symbol |
