R900912636 Lfa Valve Cartridge Valve Block Lfa16gwa-71 Lfa25D-71f

• Media: Oil
• Temperature: Ordinary Temperature
• Actuator: Pneumatic
• Shipping Cost: Estimated freight per unit.: about shipping cost and estimated delivery time.
• Currency: US$
• Return&refunds: You can apply for a refund up to 30 days after receipt of the products.
• Model NO.: LFA
• 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 R900912636 LFA valve cartridge valve block LFA16GWA-71 LFA25D-71F
 
2 area ratios 4 different springs 6 different cracking pressures

Product Description

2-way cartridge valves are elements that have been designed for a compact block design. The power section with connections A and B is installed into the control block in a receiving hole standardized according to ISO 7368 and closed with a cover. In most cases, the cover is also the connection from the control side of the power section to the pilot control valves.

By control with respective pilot control valves, the power section can be applied for pressure, directional and throttle functions or a combination of these functions. Particularly efficient solutions are realized by adjustment of the size to various flows of the individual ways of an actuator. The application of power sections of elements for multiple functions is very cost-effective.

2-way cartridge valves generally consist of control cover (1) and installation kit (2). The control cover contains the control bores and optionally a stroke limitation function, a hydraulically controlled directional seat valve or a shuttle valve according to the required overall function. Additionally, electrically operated directional spool or seat valves can be installed at a control cover. The installation kit consists of a bushing (3), ring (4) (only up to NG32), valve poppet (5), optionally with damping nose (6) or without damping nose (7) as well as closing spring (8).

The function of 2-way cartridge valves is pressure-dependent. This way, three crucial pressurized areas A1, A2, A3 are realized for the function. The area at valve seat A1 is observed as 100 %. Depending on the version, the annulus area A2 realized by grading is 7 % or 50 % of area A1. The area ratio A1 : A2 is respectively either 14.3 : 1 or 2 : 1. The area A3 is identical to the sum of areas A1 + A2. Due to the different area ratios A1 : A2 and the resulting different annulus areas (A2), the area A3 is one time 107 % and another time 150 % of the area A1 at the seat, which is observed as 100 %.

In general, the following applies:

The areas A1 and A2 are effective in opening direction. The area A3 and the spring are effective in closing direction. The direction of action of the resulting force from the opening and closing forces determines the spool position of the 2-way cartridge valve.

The 2-way cartridge valves can be passed from A to B or from B to A. Pressurization of area A3 by pilot oil discharge from channel B or external pilot oil supply, channel A is blocked without leakage.

 

01	02	03		04		05	06	07
LFA		GWA	-		/

Type
01	Control cover LFA	LFA
Size
02	NG 16	16
	NG 25	25
	NG 32	32
	NG 40	40
	NG 50	50
	NG 63	63
	NG 80	80
	NG 100	100
Version
03	Control cover version "GWA": For set-up of a directional valve	GWA
Component series
04	Component series 70 ... 79 (70 ... 79: unchanged installation and connection dimensions) 1)	7X
	Component series 60 … 69 (60 … 69: unchanged installation and connection dimensions) 2)	6X
Nozzle fitting
05	Orifice in channel A 3)	A..
06	Orifice in channel P 3)	P..
07	Orifice in channel T 3)	T..

	1) Component series 7X for sizes 16...63
	2) Component series 6X for sizes 80 and 100
	3) This orifice is designed as screw-type orifice. If an orifice is to be installed, the respective code letter with the orifice Ø in 1/10 mm has to be entered in the type designation.
	Example: A12 = Orifice with Ø1.2 mm in channel A. Additional orifice Ø see diagrams/characteristic curves.

Orifice symbol		Symbol in ordering code
A**		A**		This orifice is designed as screw-type orifice. If an orifice is to be installed, the respective code letter with the orifice Ø in 1/10 mm has to be entered in the type designation. Example: A12 = Orifice with Ø1.2 mm in channel A.
Ø1,2				This orifice is designed as bore. No specifications are made in the type designation. (Orifice Ø in mm)
Z12				This orifice is designed as screw-type orifice. This is a standard orifice. No specifications are made in the type designation. (Orifice Ø in 1/10 mm)

Notices:

For ordering code of orifices, see "Accessories" Additional functions with special numbers see "Information".

 

general

Size			16	25	32	40	50	63	80	100
Weight		kg	1.2	2.3	4	7.4	10.5	21	27	42
Ambient temperature range	NBR seals	°C	-30 … +60
	FKM seals	°C	-20 … +60
MTTFD values according to EN ISO 13849 1)		Years	150

1)	For further details, see data sheet 08012

hydraulic

Size			16	25	32	40	50	63	80	100
Maximum operating pressure	Port X 1)	bar	315 350 420
	Port Z1 1)	bar	315 350 420
	Port Y		depending on the maximum tank pressure of the attached directional valve
Maximum flow 2)		l/min	25000
Hydraulic fluid			see table
Hydraulic fluid temperature range	NBR seals	°C	-30 … +80
	FKM seals	°C	-20 … +80
Viscosity range		mm²/s	2.8 … 500
Maximum admissible degree of contamination of the hydraulic fluid, cleanliness class according to ISO 4406 (c) 3)			Class 20/18/15 according to ISO 4406 (c)

1)	dependent on the attached directional valve
2)	NG-dependent; see characteristic curves
3)	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 filter

Hydraulic fluid		Classification	Suitable sealing materials	Standards	Data sheet
Mineral oils		HL, HLP, HLPD, HVLP, HVLPD	NBR, FKM	DIN 51524	90220
Bio-degradable 1)	Insoluble in water	HETG	NBR, FKM	ISO 15380	90221
		HEES	FKM
	Soluble in water	HEPG	FKM	ISO 15380
Flame-resistant	Water-free	HFDU (glycol base)	FKM	ISO 12922	90222
		HFDU (ester base) 1)	FKM
	Containing water 1)	HFC (Fuchs Hydrotherm 46M, Petrofer Ultra Safe 620)	NBR	ISO 12922	90223
Important information on hydraulic fluids: For more information and data on the use of other hydraulicfluids, please refer to the data sheets above or contact us. There may be limitations regarding the technical valve data (temperature, pressure range, life cycle, maintenance intervals, etc.). Flame-resistant - containing water: Life cycle as compared to operation with mineral oil HL, HLP 30 … 100%. Maximum hydraulic fluid temperature 60 °C Bio-degradable and flame-resistant - containing water: If this hydraulic fluid is used, small amounts of dissolved zinc may get into the hydraulic system.

1)	Not recommended for corrosion-protected version "J3" (contains zinc)

 

 

 

 

 

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

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