About the optional gate valve
On some vessels, additional transducer protection is required. One example is vessels working in arctic conditions. It is important for them to prevent ice from damaging the transducer. A gate valve can then be added to the hull unit installation. By means of a mechanical construction it shuts off the bottom of the installation trunk when the CS90 is not used.
Image
Image
The CS90 Hull Unit is placed on the top of a DN350 Gate Valve using a transducer dock.
Transducer dock: 403038

The CS94 Hull Unit is placed on the top of a DN350 Gate Valve using a transducer dock .
Transducer dock: 430192
The drawings are not to scale.
The gate valve is manufactured by LK Valves.
•  Gate valve: DN350
•  ManufacturerLK Valves
•  Manufacturer’s websitehttp://www.lkvalves.com
Technical information about this unit is not included in this CS90 Installation Manual. Refer to the relevant end-user documentation provided by the manufacturer.
Both the CS90 and the CS94 Hull Units can be placed on the DN350 gate valve. Two different transducer docks are used.
•  Hull Unit CS90Transducer dock 403038
•  Hull Unit CS94Transducer dock 430192
The gate valve is placed at the bottom of the transducer dock. It will then increase the total height of the hull unit installation.
•  The CS90 Hull Unit is designed to lower the transducer 1.0 meter below the ship’s hull.
•  The CS94 Hull Unit is designed to lower the transducer 2.1 meter below the ship’s hull.
•  These depths are decreased with the physical height of the gate valve. The depths are further decreased with the height of the mounting flange.
•  The CS90 allows you to define a middle position for the transducer. When you define the middle position, you must take the total height of the gate valve and the mounting flange into consideration.
The installation trunk is not used when a gate valve is mounted. The installation trunk is replaced with a transducer dock.
Note
It is very important that the gate valve mechanisms are interfaced with the hull unit controller. When the gate valve is closed, it must not be possible to lower the transducer. When the transducer is lowered, it must not be possible to close the gate valve.