oventrop Hydrocontrol VFC Handbuch Seite 3

Oventrop DRV and commissioning valves are designed for installation in hot water heating and chilled water air
conditioning systems and serve to achieve a hydronic balance between the various circuits of the system.
It is important to note that the direction of flow must conform with the direction of the arrow on the valve body and that
the valve must be installed with a minimum of 3 D (3 x nominal pipe diameter) of straight pipe in the upstream side.
The required preset value can be obtained by reference to the flow chart appropriate for the size of valve. Any inter-
mediate preset value is available.
The selected preliminary setting can be made from the two-part scale - the basic scale and the fine adjustment scale.
A display of the basic setting is available even with the valve fully closed.
Handwheel
Allen key (3 mm)
Presetting :
1. The preset value of the valve is adjusted with the
handwheel.
a. The display of the basic setting is shown by the
longitudinal scale together with the sliding indicator.
Each turn of the handwheel is represented by a
line on the longitudinal scale.
b. The display of the fine setting is shown by the
peripheral scale on the handwheel and indicates
1/10th of a turn of the handwheel.
2. With the valve at the required preset value, turn the
inner disc clockwise until it seats. This can be done by
using the long end of a 3 mm allen key.
Visibility/Readability of setting scales:
Depending on the installation position of the valve, an
improvement in the visibility/readability of the setting
scales is possible by twisting the scales round. With the
valve fully closed and the indicator on '0', carefully
remove the cover plug in the centre of the handwheel
by using a small screwdriver in the slot and gently
prising it off. Then remove the cover plug, undo the
screw and with a light tug pull the handwheel from the
valve spindle.
For presetting and fine adjustment of the flow volume, Oventrop offers two types of measuring instruments, i.e:
"OV-DMC 2" flow-meter, an advanced programmable microprocessor with memory store and
Oventrop electronic differential pressure gauge (without microprocessor or memory)
Subject to technical modification without notice.
2
Presetting
Marking
Sliding
indicator
Basic setting scale
(longitudinal)
Next without altering the presetting (still indicating '0')
adjust the position of the handwheel, so that the indica-
tor window is clearly visible.
Finally refit the handwheel to the valve stem, tighten the
screw and replace the cover plug.
Protecting the setting:
A sealing wire (accessory item no. 1089091) may be
threaded through the hole in the handwheel and a lead
seal fitted.
Locking the handwheel:
The handwheel can be locked in any position, by remo-
ving the existing protection cover and replacing it with
the cover (accessory item no. 1060180). In addition, the
locked handwheel can be secured with a sealing wire.
Fine setting scale
(peripheral)
Handwheel
Screw
Hole for
sealing wire
EN
Cover plug