GENERAL CATALOGUE 2026.01

Modular units B series Soft-start valves, 1/2"

Working principles

Switching pressure point to pass from low speed to rapid speed air suppply

Air supply low speed Flow rate features in relation to number of turns of the regulation needle (P = 5 bar)

Series: B44..A

Series: B44..A

5

3000

2500

4

2000

3

1500

2

1000 Flow (l/min)

Outlet flow (l/min)

1

500

0

0

0 1 2 3 4

5 6 7 8 9 10

0

1

2

3

4

5

6

Inlet flow (l/min)

Needle valve rotations

Operative conditions

E

3 - AIR TREATMENT

M

U

T

S

1 (P)

2 (A)

3 (R)

Start-up phase By actuating the pneumatic-pilot E air will push the poppet T down opening this way the main power valve and at the same time, closing the exhaust (R). Air from inlet (P) will go through the regulation needle S and then to the outlet (A). Opening speed can be adjustable by the side screw. Switching and working phase In the moment the pressure difference between (A) and (P) is (A) ≥ (P), the poppet U fully open and outlet pressure (A) rapidly increase until equalize inlet pressure in (P). Soft-start valve will not represent any obstacle for the air-flow going through it. Closing and exhausting phase By deactivating pneumatic-pilot E the poppet T will reposition stopping the air from inlet (P) and contemporary exhaust the downstream air in the circuit from the exhaust (R).

3.4.182