Drem20 Series R901277148 Drem20-60/315yg24K4m Pilot Proportional Pressure Reducing Valve

• Media: Oil
• Temperature: Ordinary Temperature
• Actuator: Pneumatic
• Model NO.: DREM20
• Connection Form: Clamp
• Type: Distribution of Direct Acting
• Material: Cast Iron
• Pressure: Ordinary Temperature
• Valve Structure: Pilot Piston Structure
• Power Supply: AC Solenoid Valve
• Usage: Safety, Emptying, Drain, Temperature Control, Flow Control
• Standard: GB
• Application: Industrial Usage, Water Industrial Usage, Household Usage
• Color: Blue
• Warranty: 12
• Lead Time: 5
• Transport Package: Carton
• Specification: 20*15*10
• Trademark: Rexroth
• Origin: Ger
• HS Code: 8413606090
• Production Capacity: 2000/Weeks
• Package Size: 10.00cm * 10.00cm * 10.00cm
• Package Gross Weight: 10.000kg

Product Description

Rexroth DREM20 series R901277148 DREM20-60/315YG24K4M Pilot proportional pressure reducing valve
 
Valve for reducing a system pressure Operation by means of a proportional solenoid Proportional solenoid with rotatable and detachable coil For subplate mounting: porting pattern according to ISO 5781 Third way A to Y (Ø 7.5 mm) Linearized pressure/command value characteristic curve Good transient response Optional check valve between A and B Optional maximum pressure limitation

Product Description

general

Type		DRE(M)
Size		10	25
Component series		6X
Installation position		Any
Weight	kg	4.7	6
Storage temperature range	°C	-20 … +80
Ambient temperature range	°C	-20 … +70

hydraulic

Type			DRE(M)
Size			10	25
Maximum operating pressure		bar	315
Maximum operating pressure	Port A	bar	315
	Port B	bar	315
	Port T 1)		separate and depressurized to the tank
Maximum set pressure in port A	Pressure rating 50 bar	bar	50
	Pressure rating 100 bar	bar	100
	Pressure rating 200 bar	bar	200
	Pressure rating 315 bar	bar	315
Minimum set pressure 2)		bar	2
Maximum pressure relief function	Pressure rating 50 bar 3)	bar	70
	Pressure rating 100 bar	bar	130
	Pressure rating 200 bar	bar	230
	Pressure rating 315 bar	bar	350
Pilot flow		l/min	0.8
Maximum flow		l/min	200	300
Hydraulic fluid			see table
Hydraulic fluid temperature range		°C	-20 … +80
Viscosity range		mm²/s	15 … 380
Maximum admissible degree of contamination of the hydraulic fluid, cleanliness class according to ISO 4406 (c) 4)			Class 20/18/15 according to ISO 4406 (c)
Hysteresis 5)		%	± 3.5
Repetition accuracy 5)		%	< ± 2
Linearity 5)		%	± 2
Manufacturing tolerance of the command value pressure characteristic curve 6)		%	± 3.5
Step response	10 ... 90% 7)	ms	≈ 130
	90 ... 10% 7)	ms	≈ 160
	10 ... 90% 8)	ms	≈ 150
	90 ... 10% 8)	ms	≈ 150

1)	Internal pipe Ø ≥ 5 mm; pipe length < 2500 mm
2)	in channel A with command value 0
3)	set at the factory
4)	The cleanliness classes specified for the components must be adhered to in hydraulic systems. Effective filtration prevents faults and simultaneously increases the life cycle of the components. For the selection of the filters,
5)	from maximum set pressure; does not apply to types "G24-8"
6)	of the maximum set pressure, related to the hysteresis characteristic curve, pressure increasing; does not apply to types "G24-8"
7)	measured with standing hydraulic fluid column, 1.0 liters at port A
8)	measured with standing hydraulic fluid column, 5 liters at port A

Hydraulic fluid	Classification	Suitable sealing materials	Standards
Mineral oils and related hydrocarbons	HL, HLP, HLPD, HLPP	NBR / FKM	DIN 51524
Flame-resistant   - water-free	HFDU, HFDR	FKM	ISO 12922
Flame-resistant   - containing water	HFC (Fuchs HYDROTHERM 46M, Petrofer Ultra Safe 620)	NBR	ISO12922
Important information on hydraulic fluids: For more information and data on the use of other hydraulic fluids please contact us. The flash point of the process and operating medium used must be 40 K over the maximum solenoid surface temperature. Flame-resistant - containing water: maximum pressure differential 210 bar, otherwise increased cavitation erosion! Pressure peaks must not exceed the maximum operating pressures! Life cycle compared to operation with HLP 30 is 30% Maximum fluid temperature 60°C

electrical

Type				DRE(M)
Minimum solenoid current	with 1600 mA - coil		mA	≤ 100
	with 800 mA - coil		mA	≤ 100
Maximum solenoid current	with 1600 mA - coil		mA	1760
	with 800 mA - coil		mA	840
Solenoid coil resistance	Cold value at 20 °C	with 1600 mA - coil	Ω	5.5
		with 800 mA - coil	Ω	20.6
Solenoid coil resistance	Maximum hot value	with 1600 mA - coil	Ω	8.05
		with 800 mA - coil	Ω	33
Duty cycle			%	100

Type DRE...

The pressure in channel A is set in a command value-dependent form via the proportional solenoid (2).

In rest position - no pressure in channel B -, the spring (17) holds the main spool (4) in its initial position. The connection from channel B to A is closed. A start-up jump is thereby prevented.

The pressure in channel A acts on the surface (7) of the main spool via the bore (6). The pilot oil is taken from channel B and flows through the bore (8) to the constant-current control (9) that keeps the pilot flow constant independent of the pressure drop between channel A and B. From

the constant-current control (9), the pilot flow flows in den spring chamber (10), through the bores (11) and (12) via the valve seat (13) into channel Y (14, 15, 16) and from there to the return flow. The pressure required in channel A is preset at the related amplifier. The proportional solenoid moves the valve poppet (20) in the direction of the valve seat (13) and limits the pressure in the spring chamber (10) to the set value. If the pressure in channel A is lower than the preset command value, the higher pressure in the spring chamber (10) moves the main spool to the right. The connection from B to A is opened. If the set pressure in A is reached, the forces at the main spool are balanced - the main spool is in control position.

Pressure in channel A • Spool face (7) = pressure in spring chamber (10) • Spool face - spring force (17)

If in a standing hydraulic fluid column (e. g. cylinder piston at stop), the pressure in A is to be reduced, (e. g.) a lower command value is preset at the control electronics and in this way a lower pressure is preselected which is present immediately in the spring chamber (10). The higher pressure in A which acts on the surface (7) of the main spool pushes the main spool to the stop against the plug screw (18). The connection A to B is blocked and A to Y is open. The force of the spring (17) now counteracts the hydraulic force acting on the surface (7) of the main spool. In this main spool position, the hydraulic fluid can flow from channel A via the control edge (19) to Y into the return flow.

When the pressure in A has dropped to the pressure in the spring chamber (10) plus p from spring (17), the main spool closes the large control bores in the socket at the control edge A to Y.

 

 

 

 

 

 

 

Quantity(pieces)	1 - 5	>5
Lead time (days)	10	To be negotiated

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