Instruction Manual
D104485X012
Vonk Choke Valves
September 2019
4
In case of a HT version valve, the bonnet should not be insulated (this may over-heat the bonnet).
After installation, check the operation of the valve by stroking it to 'full open' and 'full close'. The position of the valve
can be indicated in the following ways:
1. Mechanical, by a dial plate showing the position of the valve. The following methods are available:
a. Percent of the full stroke of the actuator
b. Percent opening of the valve
c. Equivalent bean size in 1/64-inch increments
2.
Electrical limit switches indicating end of stroke of the actuator.
3. Electronic valve position transmitter, presenting the position of the valve:
a. As a 4-20 ma signal
b. As a 4-20 ma signal with 'smart' transmitter information (HART
®
protocol)
c. As a fieldbus signal (e.g. F
OUNDATION™ fieldbus, PROFIBUS)
Figure 2. Vonk Choke Valves Open / Throttled / Shut
BONNET SHAFT
SPRING
SOFT SEALS
BODY PROTECTING BUSH
TURNING FORK
FRONT DISK
SOFT SEALS
BACK DISK AND BEAN CARRIER
BODY
OPEN
THROTTLED
SHUT
BODY / BONNET BOLTING
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