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Varioflow double safety process valves - series 8700
Instruction manual DN125 - DN150
6 Operation
6.1 Operation with air
The valve is provided with three air connections with 1/8" BSP female-thread.
P I:
Clean drain space via lower valve body.
P II:
Open valve.
P III:
Clean drain space via upper valve body.
The air supply must be connected to the valve such that it is impossible to pressurize more than
one connection at a time.
During cleaning it must be impossible to pressurize P II and P III simultaneously.
There must be a delay of about 10 s when changing from one connection to another.
Air connections that are not used must be equipped with bleed nipples.
6.2 Connection of flushing chambers.
The flushing chamber has feed and drain connections with 1/8"G (up to 4" - DN100) or 1/4"G
(DN125-150) female thread. To prevent internal contamination or ingress of pollutants, cleaning
liquid or steam (standard of up to 121°C) be applied to the flushing chambers. Liquids enter at the
bottom (B) and exit at the top (A) of the flushing chambers. Steam enters at the top (A) and exits
at the bottom (B). See also 5.2.
6.3 Indication of valve position.
The valve can be provided with a bracket for proximity switches. The following situations are
possible:
Seat open
6.4 Control unit
The valve can also be provided with a control unit. Most commercially available unites can be
fitted.
7 Cleaning and maintenance
7.1 Cleaning
The valve is suitable for C.I.P. cleaning.
The drain space can be cleaned by supplying pressurized air for a few seconds to P III (to clean
the upper body) or P I (to clean the bottom body). See 6.1
The flushing chambers can be cleaned with water or detergents.
Low pressure steam (standard of up to 121°C) can be used for sterilization.
The valve material is resistant to detergents that are commonly used in the food industry, such as
a lye (NaOH) or acid (HNO 3 ) solution of about 2 1/2% at a temperature of about 80°C. After
cleaning, the system must be rinsed with clean water to prevent corrosion.
7.2 Lead-time
Sealing and wearing parts of the valve must be checked once a year. For special applications
(such as highly viscous or crystallizing liquids) the lead-time must be adjusted in consultation with
the manufacturer.
7.3 Safety measures during maintenance
When disassembling the valve, the pipework must be empty. With disassembled valves, it must
be prevented that the pipework can be filled accidentally by, e.g., starting a pump or activating a
valve.
When disassembling or assembling the actuator, the instructions must be followed.
Please take special care when the pressure springs expand!
Tyco reserves the right to change the contents without notice
Seat closed
Open/close indication
page 3
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