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WEBTEC VFC55-K-A Owner's manual

  • Hello! I'm your chat assistant. I've reviewed the datasheet for WEBTEC's VFC Series flow control valves, including models VFC20, VFC40 and VFC55. This document details the specifications, features like pressure compensation and adjustable flow rates, and performance data. I'm ready to answer any specific questions you might have about these valves or their capabilities.
  • What is the maximum pressure for these valves?
    What is the maximum flow rate?
    What materials are the valve's body made from?
    What is the adjustment range for the flow rate?
1
webtec.com
VFC Series
Variable Flow Pressure Compensated
Control Valve
Variable Flow Control Valves maintain the flow rate of hydraulic fluid to a selected
value.
Applications include hydraulic cylinders requiring constant extension or
retraction speeds and hydraulic motors requiring constant rotational speeds.
When used with a fixed delivery pump the excess flow is By-Passed across a
relief valve.
Specications
Maximum Pressure: 210 bar, 3000 psi
Maximum Flow: 55 L/min, 15 US gpm
Porting: SAE, BSPP & NPTF
Materials: Body Materials: Aluminium
Internal Materials: Carbon Steel
Seals: NBR, PTFE
Features
●Pressure compensated
to ensure a constant
flow rate under varying
pressures
●Knurled knob enables
fast, accurate adjustment
of flow rate in one
direction (under pressure)
from 1.5 L/min to 55 L/
min, 0.5 US gpm to 15 US
gpm.
●Knurled knob can be
locked in position by a
socket (set) screw and
provides weatherproof
sealing to prevent the
adjusting screw from
corroding or seizing.
●Free (uncontrolled) flow
is permitted in reverse
direction.
VFC-BU-ENG-2376.pdf - 03/22 - ISSUE 8.0
ISO Symbol
webtec.com
2
Table 2: Porting
CODE Flow Size Code Porting
J
20 1/4” BSPP
40 3/8” BSPP
55 1/2” BSPP
A
20 1/4” NPTF*
40 3/8” NPTF*
55 1/2” NPTF*
G
20 7/16” -20UN #4 SAE ORB
40 9/16” -18UN #6 SAE ORB
55 3/4” -16UN #8 SAE ORB
Table 1: Valve Model
CODE Flow Size
L/min US gpm
20 1.5 - 20 0.5 - 5
40 2.0 - 40 0.5 - 10
55 2.0 - 55 0.5 - 15
VFC-BU-ENG-2376.pdf - 03/22 - ISSUE 8.0
TYPICAL CODE DESCRIPTION SEE TABLE YOUR CODE
VFC Variable Flow Control -VFC
20 Flow Size Table 1
KAdjustment Method (Knurled Knob) -K
JPorting Table 2
Sales Order Code
Please contact our technical sales team to discuss any special order requirements.
* All NPTF threads are to ANSI B1.20.3 -1976 Class 1. As stated in the standard
it is recommended that “sealing is accomplished by the means of a sealant
applied to the thread”. NPT fittings may also be used to connect to NPTF ports
(also with a sealant applied to the thread).
Reverse Flow Typical Pressure Drop
All tests completed using ISO32 Mineral oil at 40 degrees C (32 cSt)
0246810 12 14 16 18
0
50
100
150
200
250
0
4
8
12
16
010203040506070
Flow L/min
010 20 30 40 50 60 70
2 4 6 8 10 12 14 16 18
Flow US gpm
Pressure psi
250
200
150
100
50
Pressure bar
16
12
8
4
VFC20
VFC40 VFC55
3
webtec.com VFC-BU-ENG-2376.pdf - 03/22 - ISSUE 8.0
Webtec reserve the right to make improvements and changes to the specification without notice
Installation Details
Table Dimensions
FLOW SIZE
CODE A B C D E F H WEIGHT
UNITS mm in mm in mm in mm in mm in mm in mm in kg lb
20 69.5 2.74 19.1 0.75 32.9 1.30 25.0 0.98 44.5 1.75 86.0 3.39 28.5 1.12 0.2 0.4
40 84.4 3.32 24.0 0.94 44.0 1.73 35.3 1.40 57.1 2.25 107.0 4.21 38.1 1.50 0.4 0.9
55 86.3 3.40 24.0 0.94 49.0 1.93 38.1 1.50 63.5 2.50 118 .5 4.67 42.4 4.67 0.5 1.1
VFC40 Typical Performance Data
All tests completed using ISO32 Mineral oil at 40 degrees C (32 cSt)
Pressure bar
34 69 103 138 172 207
500 1000 1500 2000 2500 3000
Pressure psi
47.3
37.9
28.4
18.9
9.5
0
12.5
10.0
7.5
5.0
2.5
0
Flow L/min
Flow US gpm
A
C
B
D A/F
Locking Screw
Knurled Knob
Adjustment
H A/F
F
E
CONTROLLED FLOW
FREE FLOW
/