In-line piloted check valve with pre-opening

In-line piloted check valve with pre-opening

The controllable check valve allows free flow of oil in one direction, while in the opposite direction the passage is prevented until the valve is opened by sending pressure to the pilot port.

Normally equipped with a pre-opening device that allows an initial decompression before the total release, the valve is particularly suitable for prolonged pressure maintenance in actuators or other circuits.

General and hydraulic characteristics

  • Valve construction: seat with hermetically sealed conical shutter
  • Mounting type: in line on the piping
  • Mounting position: indifferent
  • Maximum capacity: see table
  • Permissible fluid: Mineral oil according to DIN 51524-51525
  • Continuous operating temperature: -20°C – + 85°C
  • Fluid temperature: -15°C – + 80°C
  • Fluid temperature range: see graph
  • Surface protection: from 2.5 to 400cSt (from 1 to 50°E)
  • Recommended nominal viscosity: 35 cSt (4.5°E) at 50°C

 

Bocche E-U [B.S.P.]
Bocca P [B.S.P.]
Passage section [mm²]
Max pressure on mouth E-U-P [bar]
Opening pressure E → U [bar]
Nominal rate [l/min]
Maximum capacity [l/min]
Opening report [K]
Pre-purpose report [W]
Press. Add. For compress pilot springs [Y]
Residual pressure admitted on the pilotage [bar]
Pilot cylinder [cm³]
Weight [kg]

DCZ-10F: 1/2”
DCZ-15F: 3/4”
DCZ-20F : 1”
DCZ-25F: 1 1/4”
DCZ-30F: 1 1/2”

DCZ-10F: 1/4”
DCZ-15F: 1/4”
DCZ-20F : 1/4”
DCZ-25F: 1/4”
DCZ-30F: 1/4”

DCZ-10F: 75
DCZ-15F: 160
DCZ-20F : 280
DCZ-25F: 450
DCZ-30F: 640

DCZ-10F: 400
DCZ-15F: 400
DCZ-20F : 400
DCZ-25F: 400
DCZ-30F: 400

DCZ-10F: 0.4
DCZ-15F: 0.4
DCZ-20F : 0.4
DCZ-25F: 0.4
DCZ-30F: 0.4

DCZ-10F: 35
DCZ-15F: 70
DCZ-20F : 110
DCZ-25F: 170
DCZ-30F: 250

DCZ-10F: 50
DCZ-15F: 100
DCZ-20F : 155
DCZ-25F: 240
DCZ-30F: 350

DCZ-10F: 1.6
DCZ-15F: 1.4
DCZ-20F : 1.4
DCZ-25F: 1.4
DCZ-30F: 1.4

DCZ-10F: 12
DCZ-15F: 16
DCZ-20F : 16
DCZ-25F: 18
DCZ-30F: 16

DCZ-10F: 4.5
DCZ-15F: 4.5
DCZ-20F : 4.5
DCZ-25F: 4.5
DCZ-30F: 4.5

DCZ-10F: 1
DCZ-15F: 1
DCZ-20F : 1
DCZ-25F: 1
DCZ-30F: 1

DCZ-10F: 0.78
DCZ-15F: 2
DCZ-20F : 4.1
DCZ-25F: 7.7
DCZ-30F: 12.5

DCZ-10F: 1
DCZ-15F: 2
DCZ-20F : 2.6
DCZ-25F: 4.5
DCZ-30F: 6.1

For the good functioning of the valve it is advised not to pressure the mouth E during the reverse flow in the driving phase; any chokes or flow regulators must be installed on the U-mouth.

Otherwise, or in applications where pressure multiplication occurs on the mouth U or in any case in general, release is only possible when the relationship is verified:

PP = [PE + Y + (PU-PE)] : K