TYPE D HEADS
STANDARD LOW-DISHED HEADS
Specifications summary
Drawing legend
Tolerances
| D | R | r | h | s |
|---|---|---|---|---|
| 500 ÷ 3050 | 1.5 ÷ 2 D | 50 | ≥ 5 x s | 3 ÷ 25 |
| 3100 ÷ 3450 | 1.5 ÷ 2 D | 80 | ≥ 5 x s | 3 ÷ 25 |
| 3500 ÷ 5000 | 1.5 ÷ 2 D | 100 | ≥ 5 x s | 3 ÷ 25 |
| R = 2D r = 50 | |
| SV | D x 1.03 + 2h |
| Ht | D x 0.090 + h + s |
External diameter
Height of the straight flange
Internal diameter
Total external height = H+h+s
Thickness
Internal height without straight flange
Dishing radius
Diameter of the blank disc required to produce the head
Knuckle radius
Capacity in liters of the head
For pressed heads, the tolerances applied are those of the standards in force (in particular the AFRON NFE 81-100/1997 standard)
For spun heads, the tolerances are as follows:
On external diameter:
< Ø 2000 = ± 2 ‰ · Ø
> Ø 2000 = ± 3 ‰ · Ø
Out-of-roundness (maximum difference between minimum diameter and maximum diameter)
± 3 ‰ · Ø
Total height (for non-trimmed heads)
– 0 +25 mm
Plates
The dimensional and shape tolerances of the plates to be taken as reference, unless otherwise agreed contractually, are in accordance with standards UNI EN 10025 and UNI EN 10051.
However, it is possible to request tighter tolerances at the time of order, for which feasibility will be assessed.
Drawing legend
External diameter
Height of the straight flange
Internal diameter
Total external height = H+h+s
Thickness
Internal height without straight flange
Dishing radius
Diameter of the blank disc required to produce the head
Knuckle radius
Capacity in liters of the head
Specifications summary
| D | R | r | h | s |
|---|---|---|---|---|
| 500 ÷ 3050 | 1.5 ÷ 2 D | 50 | ≥ 5 x s | 3 ÷ 25 |
| 3100 ÷ 3450 | 1.5 ÷ 2 D | 80 | ≥ 5 x s | 3 ÷ 25 |
| 3500 ÷ 5000 | 1.5 ÷ 2 D | 100 | ≥ 5 x s | 3 ÷ 25 |
| R = 2D r = 50 | |
| SV | D x 1.03 + 2h |
| Ht | D x 0.090 + h + s |
Tolerances
For pressed heads, the tolerances applied are those of the standards in force (in particular the AFRON NFE 81-100/1997 standard)
For spun heads, the tolerances are as follows:
On external diameter:
< Ø 2000 = ± 2 ‰ · Ø
> Ø 2000 = ± 3 ‰ · Ø
Out-of-roundness (maximum difference between minimum diameter and maximum diameter)
± 3 ‰ · Ø
Total height (for non-trimmed heads)
– 0 +25 mm
Plates
The dimensional and shape tolerances of the plates to be taken as reference, unless otherwise agreed contractually, are in accordance with standards UNI EN 10025 and UNI EN 10051.
However, it is possible to request tighter tolerances at the time of order, for which feasibility will be assessed.
SINCE 1965 TECNOFONDI SPA HAS BEEN PRODUCING DISHED HEADS, RELY ON THE INDUSTRY LEADERS
Main applications
THERMO-HYDRAULIC
FARMING
FOOD
CHEMICAL AND PHARMACEUTICAL
FABRIC INDUSTRY
