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Throttle valve FG

Name: Throttle valve FG
Brand: Bosch Rexroth
SKU: RX7434

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Description

Size 16 … 32
Component series 2X
Maximum operating pressure 315 bar
Maximum flow 400 l/min

Features

For block installation (cartridge valve, screw-in cartridge valve)
3 adjustment types, optional• Rotary knob• Lockable rotary knob with scale• Rotary knob with scale

Product description

Type FG . K… (Cartridge valve)

The valves type FG are throttle valves. The flow depends on the pressure differential between A and B and on the viscosity of the hydraulic fluid.

The valves mainly consist of adjustment type (1), housing (2) and throttle bolt (3).

The flow is throttled from A to B. The throttle cross-section (5) is adjusted by displacing the throttle bolt (3) in axial direction.

Type FG . C… (Screw-in cartridge valve)

In principle, the function of these valves corresponds to the function of version "K". However, they are delivered without housing (2) and thus can be screwed into the block directly.

Type FG . K1…

Type code

01	02	03	04	05		06		07	08
FG				0	–	2X	/		*

01	Throttle valve	FG
02	Size 16	16
	Size 25	25
	Size 32	32

03	Cartridge valve	K
03	Cartridge valve	C
Adjustment type
04	Rotary knob	1
	Lockable rotary knob with scale	3
	Rotary knob with scale	7
Cracking pressure
05	Without spring	0
06	Component series 20 … 29 (20 … 29: unchanged installation and connection dimensions)	2X
Seal material
07	NBR seals	no code
	FKM seals	V
	Observe compatibility of seals with hydraulic fluid used. (Other seals upon request)
08	Further details in the plain text	*

Technical data

general

Size			16	25	32
Weight	Cartridge valve "K"	kg	0.8	1.7	4
Weight	Screw-in cartridge valve "C"	kg	0.4	0.7	1.7
Installation position			any
Ambient temperature range	NBR seals	°C	-30 … +80
Ambient temperature range	FKM seals	°C	-20 … +80

hydraulic

Size			16	25	32
Maximum operating pressure		bar	315
Maximum flow (standard valves)		l/min	100	200	400
Hydraulic fluid			see table
Hydraulic fluid temperature range	NBR seals	°C	-30 … +80
Hydraulic fluid temperature range	FKM seals	°C	-20 … +80
Viscosity range		mm²/s	10 … 800
Maximum admissible degree of contamination of the hydraulic fluid 1)			Class 20/18/15 according to ISO 4406 (c)
Actuating torque approx. (adjustment type)		Nm	5

1)	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, see www.boschrexroth.com/filter.

Hydraulic fluid		Classification	Suitable sealing materials	Standards
Mineral oils and related hydrocarbons		HL, HLP, HLPD, HVLP, HVLPD	NBR, FKM	DIN 51524
Environmentally compatible	Insoluble in water	HETG	NBR, FKM	ISO 15380
	Insoluble in water	HEES	FKM	ISO 15380
	Soluble in water	HEPG	FKM	ISO 15380
Containing water	Water-free	HFDU, HFDR	FKM	ISO 12922
Important information on hydraulic fluids! For further information and data on the use of other hydraulic fluids, please refer to data sheet 90220 or contact us! There may be limitations regarding the technical valve data (temperature, pressure range, life cycle, maintenance intervals, etc.)!

(For applications outside these values, please consult us!)

Diagrams/characteristic curves

(measured with HLP46, ϑOil = 40 ±5 °C)

Δp-qV characteristic curves ‒ NG16

Δp-qV characteristic curves ‒ NG25

Δp-qV characteristic curves ‒ NG32

Symbols/Circuit diagrams

Dimensions

Cartridge valve “K”

Dimensions in mm

1	Adjustment type "1"
2	Adjustment type "7"
3	Adjustment type "3"
4	Setting range
5	Space required to remove the key
9	Valve mounting screws (cartridge valve "K")

NG	ØD1	ØD2	H1	H2	H3	H4	H5	H6	▢ L1	▢ L2	SW
NG	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm
16	8.4	13.5	5.2	12	62.5	79.5	10	2	65	48	30
25	14	20	8	20	70	88	12	2	80	55	36
32	18	26	10	26	75	93	14	2	105	70	55

Installation bore
Dimensions in mm

1)	Visual inspection

6	Depth of fit
7	Port A can be positioned around the central axis of port B. (Attention! Observe the position of the mounting bores!)

Connection surface
Dimensions in mm

General tolerances ISO 2768-mK

NG	ØD3		ØD4		ØD5	ØD6	D7	H7	H8	H9	H10		H11	H12	L2
NG	mm				mm	mm		mm	mm	mm	mm	mm	mm	mm	mm
16	38	H7	36	H7	15	15	M8	20.5	34	44	47	+ 0.1	16	33	48
25	52	H7	50	H7	25	20	M12	24	40.5	55	60.5	+ 0.1	19	39.5	55
32	72	H7	70	H7	35	30	M16	35	58	75	80.5	+ 0.1	26	57.5	70

Screw-in cartridge valve “C”

Dimensions in mm

1	Adjustment type "1"
2	Adjustment type "7"
3	Adjustment type "3"
4	Setting range
5	Space required to remove the key
10	Tightening torques (screw-in cartridge valve "C"):
	NG16 MA = 170 Nm ±10 %, moisten thread with hydraulic fluid
	NG25 MA = 305 Nm ±10 %, moisten thread with hydraulic fluid
	NG32 MA = 600 Nm ±10 %, moisten thread with hydraulic fluid
	Notice! The tightening torques refer to a housing tensile strength of at least 300 N/mm2 (corresponds to GG30)

Screw-in cartridge valve “C”

Mounting cavity
Dimensions in mm

1)	Visual inspection
2)	Pipe thread according to ISO 228-1

General tolerances ISO 2768-mK

6	Depth of fit
7	Port A can be positioned around the central axis of port B. (Attention! Observe the position of the mounting bores!)
8	Control edge

Valve mounting screws Cartridge valve "K" (separate order)

NG16

4 hexagon socket head cap screws

ISO 4762 - M8 x 20 - 10.9-flZn-240h-L

Friction coefficient μtotal = 0.09 to 0.14,

Tightening torque MA = 30 Nm ±10 %,

Material no. R901021242

NG25

4 hexagon socket head cap screws

ISO 4762 - M12 x 25 - 10.9-flZn-240h-L

Friction coefficient μtotal = 0.09 to 0.14,

Tightening torque MA = 102 Nm ±10 %,

Material no. R913000128

NG32

4 hexagon socket head cap screws

ISO 4762 - M16 x 35 - 10.9-flZn-240h-L

Friction coefficient μtotal = 0.09 to 0.14,

Tightening torqueMA = 250 Nm ±10 %,

Material no. R913000509

Notice!

The tightening torques refer to the maximum admissible operating pressure. Friction coefficients, tightening torques, and preload forces interact with each other.For this reason, checking of the mounting characteristics with original components and boundary conditions is recommended.

Tightening torques depend on the stability of the installation housing!

NG	H3	H4	H5	SW
NG	mm	mm	mm	mm
16	50.5	67.5	10	30
25	50	68	12	36
32	49	67	14	55

NG	ØD5		ØD6	ØD8		ØD9		D10	H7	H10		H13	H14		H15	H16	H17
NG	mm		mm	mm	mm	mm			mm	mm	mm	mm	mm	mm	mm	mm	mm
16	10	H6	10	34.1	+ 0.2	28	H6	G3/4	33	39.5	- 0.2	26	8.2	+ 0.1	2	22	1.5
25	18	H6	20	51.1	+ 0.2	44	H6	G1 1/4	41.5	55	- 0.2	27	9.4	+ 0.1	2.5	27	2
32	28	H6	30	70.1	+ 0.2	60	H6	G 2	56	73.5	- 0.2	29	8.5	+ 0.1	2.5	36	3

Downloads

Throttle and throttle check valve
Data Sheet | RE27226 | 2011-11-01 | English | PDF | 803k
Product Groups: Throttle valves
Types FG and FK

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