Pressure Sequence Valve DZ

Pilot-operated sequence valves DZ are used for pressure-dependent sequential switching of secondary circuits. Huade® hydraulic valves has always come up to the international standards. Huade® pressure valves win wide market recognition and user trust is mainly due to its high quality and relatively lower price. The factory pays great attention to product quality and introduces advanced production machines from all over the world.

Product parameter of Pressure Sequence Valve DZ

Product Feature And Application of Pressure Sequence Valve DZ

Features:

▶ For subplate mounting

▶ 4 adjustment elements

.Rotary knob

. Sleeve with hexagon and protective cap

. Lockable rotary knob with scale

. Rotary knob with scale

▶ 4 pressure ratings

▶ Check valve, optional

▶ Mounting pattern to DIN 24 340, form D,ISO 5781 and CETOP - RP 121H

Application:

Pressure valves type DZ are pilot operated pressure sequence valves. They are used for pressure dependent sequence switching of a second circuit.

Section and symbol of Pressure Sequence Valve DZ

The pressure sequence valves basically consist of main valve (1) with main spool insert (7) and

pilot valve (2) with pressure adjustment element and check valve (3), optional.

The valve function varies according to pilot oil drain configuration:

Sequence valve type DZ. 50B/..

(Control lines 4.1, 12 and 13 open; control lines 4.2, 14 and 15 plugged)

The pressure in line A acts on the pilot spool (5) in the pilot valve (2) via the control line (4.1).

At the same time it acts on the spring loaded side of the main spool (7) via orifice (6).When the

pressure exceeds the value set at spring (8), the pilot piston (5) is moved against the spring (8).

The signal is obtained internally from port A via control line (4.1).

The fluid on the spring loaded side of the main piston (7) now flows to port B via orifice (9), control land (10) and control lines (11) and (12).There is now a pressure drop at main spool (7), the connection from port A to port B is open maintaining the pressure set at spring (8). The leakage oil at pilot piston (5) is led to port B internally via control line (13). An optional check valve (3) can be fitted for free return flow from port B to A.

Sequence valve type DZ...50B/...X..

(Control lines 4.2, 12 and 13 open; control lines 4.1, 14 and 15 plugged)

The function of this valve is principally the same as for valve DZ--50B/.

However, on pressure sequence valve type DZ...50B/...X... the signal is given externally by

means of control line (4.2).

Sequence valve type DZ...50B/...Y.

(Control lines4.1, 12 and 14 or 15 open;control lines 4.2, and 13 plugged)

The function of this valve is principally the same as for valve type DZ...50B/... However, for type DZ. .50B/...Y... leakage at pilot piston (5) must be drained to tank without pressure via line (14) or (15). Pilot oil is fed to port B via line (12).

Sequence valve type DZ...50B/...XY..

(Control lines 4.2, 14 or 15 open;control lines 4.1, 12 and 13 plugged)

Pressure in port X acts on the pilot piston(5) in the pilot valve(2) via control line(4.2). At the same

time pressure in port A acts on the spring loaded side of the main spool (7) via orifice (6). When

the pressure in port X exceeds the value set at the spring (8), the pilot piston (5) is moved against the spring (8). When pilot piston (5) is moved against spring (8), fluid can pass from the spring loaded side of the main spool (7) into the spring chamber (17) of the pilot valve (2) via orifice (9)

and line (16) and pressure breaks down on the spring loaded side of the main spool (7).

The fluid can, therefore, pass from port A to B with minimum loss of pressure. The pilot oil in spring chamber (17) should be drained to tank without pressure via line (14) or (15). An optional check valve (3) can be fitted for free return flow from port B to A.

structure of DZ...50B/210...  

Symbols of DZ...50B