| Type | Pressure Rating for
type (Order No.) | Connection-
thread1) | Flow Rate2)l/h | Viscosity Range2)cSt | Article-No. | | for GG 25 | for GGG 40 | | B - PP - E - | 0 = 0,5 - 1,5 bar
1 = 1 - 4 bar
2 = 2 - 9 bar
3 = 6 - 29 bar
4 = 15 - 40 bar | G ¼" | 6 - 120 | 2,8 to 480 | 210001 | – | | B - P - E - | G 3/8" | 15 - 160 | 2,8 to 480 | 210002 | – | | B - G - E - | G ½" | 30 - 600 | 2,8 to 480 | 210003 | 210043 | | B - GH - E -3) | G ¾" | 100 - 2000 | 2,8 to 480 | 210004 | 210044 | | B - GHG - E - | G 1" | 300 - 6000 | 2,8 to 480 | 210005 | 210045 | | B - GHG - R 1 ¼" - E - | G 1 ¼" | 500 - 10000 | 2,8 to 480 | 210006 | – |
1) Cyl. Withworth Pipe Threading G...A DIN ISO 228
2) Performance curvehere
3) No pressure stage 0, instead 1: 0.5 - 3.5 bar. Refer to chart for all other pressure stages. |
| Type | a | b1 | c1 | d1 | d2 | f1 | max. pipe | NW | f2 | Adjustable range h at stage: | | 0 + 1 | 2 | 3 | 4 | | PP | 44 | 36 | 34 | 26 | 40 | G ¼" | 10 x 1 | 8 | G 1/8" | 10 | 6 | 6 | 1,5 | | P | 55 | 51 | 37 | 36 | 52 | G 3/8" | 12 x 1 | 10 | G 1/8" | 15 | 12 | 8 | 7 | | G | 55 | 51 | 37 | 36 | 52 | G ½" | 18 x 1,5 | 15 | G 1/8" | 15 | 12 | 8 | 7 | | GH | 63 | 57 | 43 | 50 | 70 | G ¾" | 22 x 1,5 | 20 | G ¼" | 15 | 10 | 8 | 5 | | GHG | 80 | 71 | 60 | 56 | 86 | G 1" | 28 x 1,5 | 25 | G ¼" | 20 | 17 | 9 | 6 | | GHG - 1 ¼" | 80 | 71 | 60 | 56 | 86 | G 1 ¼" | 35 x 2 | 30 | G ¼" | 20 | 17 | 9 | 6 |
Mode of Operation E; with adjustment screwFor lubricating and hydraulic oils and many other self-lubricating, non-corrosive fluids. Maximum temperature of delivery fluid: 250 °C. Material: Casing of hydraulic cast iron (GG 25 or GGG 40). Piston, valve tip, spring of hardened steel.  Action: Directly controlled,
spring-loaded overflow valve to maintain
a set operating pressure or a set maximum pressure. |  |  |  | | 
| |
| | Type | Pressure Rating for type
(Order No.) | Flange1)
DIN2635 PN40 | Flow Rate2)l/h | Viscosity Range2)
cSt | Article-No. | | FDR 15 - E - | 0 = 0,5 - 1,5 bar
1 = 1 - 4 bar
2 = 2 - 9 bar
3 = 6 - 29 bar
4 = 15 - 40 bar
| DN 15 | 30 - 600 | 2,8 to 480 | 270001 | | FDR 20 - E -3) | DN 20 | 100 - 2000 | 2,8 to 480 | 270002 | | FDR 25 - E - | DN 25 | 300 - 6000 | 2,8 to 480 | 270003 | | FDR 32 - E - | DN 32 | 500 - 10000 | 2,8 to 480 | 270004 |
1) Counter flange with seal + screws must be ordered separately!
2) Performance curvehere
3) No pressure stage 0, instead 1: 0.5 - 3.5 bar. Refer to chart for all other pressure stages.
| |  |  | | Size Chart | | Type | with hp
Overflow Valve | a | b | DIN-Flange
DIN 2635 | Ø D | Ø k | Ø d |
suitable counter
flanges for
PN10 - 40
as DIN 2632-35 | | FDR 15 | B - G = ½" | 55 | 92 | DN 15 | 95 | 65 | 14 | | FDR 20 | B - GH = ¾" | 63 | 118 | DN 20 | 105 | 75 | 14 | | FDR 25 | B - GHG = 1" | 80 | 134 | DN 25 | 115 | 85 | 14 | | FDR 32 | B - GHG = 1 ¼" | 80 | 138 | DN 32 | 140 | 100 | 18 |
 Usage: Modulating Kit The regulating valve is used to adjust the oil flow at the backflow of the burner unit. This is needed to ensure the proper nozzle flow and burner output required. |
| | Type | Pressure Rating | Connection | Casting
material | Flow Rate I/h | Viscosity Range cSt | Article
No | Weight
kg | for fuel
oil | | DRV 18 EL | 2 = 2-18bar
3 = 15-25 bar | G 3/8" | GG 25 | 300-600 | 2,8 to 480 | 025 0202 | 1,5 | EL | | DRV 19 EL | G ¾" | GG 25 | 1000-2000 | 2,8 to 480 | 025 0206 | 3 | EL | | DRV 21 S | G 3/8" | GGG 40 | 300-600 | 2,8 to 480 | 025 0210 | 1,5 | S | | DRV 22 S | G ¾" | GGG 40 | 1000-2000 | 2,8 to 480 | 025 0214 | 3 | S |
| |  | | Pressure
Turning the pressure regulating screw to the right (clockwise) with a screwdriver or with an
Allan screw will increase the pressure and turning it to the left (counterclockwise) will
reduce the pressure.
Description:4Regulating Screw |9Valve Cone |10Piston |11Spring | | | Size Chart | a | b1 | b2 | b3 | b4 | Flange ConnectionMeasurement | | L | B | Hole Pattern | Hole Pattern | Ø | | DRV 18 EL + 21 S | 54 | 102 | 56 | 46 | 250 | 70 | 48 | 58
54 x 30 | 2
4 | 8 | | DRV 19 EL + 22 S | 63 | 119 | 76 | 46 | 300 | 70 | 70 | 54 x 54 | 4 | 8 |
 Mode of Operation E; with adjustment screwFor lubricating and hydraulic oils and many other self-lubricating, non-corrosive fluids. Maximum temperature of delivery fluid: 150 °C. Material: Cast Iron GS - C 25 with Certificate 3.1 B Piston, valve tip, spring of hardened steel. Action: Directly controlled,
spring-loaded overflow valve to maintain
a set operating pressure or a set maximum pressure. |
| | Type | Pressure Rating | SAE-Flange
Connection | Flow Rat
l/h | Viscosity Range
cSt | Article
No | Weight
kg | | B - G - E - SAE ½" | 2 = 2 - 9 bar
3 = 15 - 25 bar
4 = 15 - 40 bar | G ½" | 30 - 600 | 2,8 to 480 | 027 0210 | 2,30 | | B - GH - E - SAE ¾" | G ¾" | 100 - 2000 | 2,8 to 480 | 027 0220 | 4,10 | | B - GHG - E - SAE 1" | G1" | 300 - 6000 | 2,8 to 480 | 027 0230 | 6,30 |
| |  | | Model Equipped with Regulating Screw
Turning the pressure regulating screw to the right (clockwise) with a screwdriver or with an
Allan screw will increase the pressure and turning it to the left (counterclockwise) will
reduce the pressure. | | | Size Chart | a | b1 | c1 | d1 | d3 | f1 | f2 | SAEFlange Connection | | Size | A | B | M | | BG - E - SAE ½" | 55 | 51 | 37 | 68 | 54 | Ø 13 | G¼" | ½" | 38,1 | 17,5 | M 8 | | BGH - E - SAE ¾" | 63 | 57 | 43 | 88 | 65 | Ø 19 | G¼" | ¾" | 47,6 | 22,2 | M 10 | | BGH - E - SAE 1" | 80 | 69 | 68 | 102 | 68 | Ø 25 | G¼" | 1" | 52,4 | 26,2 | M 10 |
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