Common sizes and the arrangement of music note seal over the seal base plate. The initial interference note type seal shall vary from 2 to 5 mm depending upon the requirement and type of its installation discretion of the designer.

The music note seal is generally recommended to be used on gates operated for head up to 30 metres. hollow bulb music note seal is recommended for gates operated at low head up to 15 metres.

A solid bulb music note seal is recommended for gates operated at medium head, that is at a head
exceeding 15 m but less than 30 m.

Stem Seal

This type of seal is used for heads exceeding 30 m. The sealing will be obtained due to interference pressure between the seal seat and seal and also behind the seal in space between the seal base plates. The sealing bulb should project 6mm beyond the face of the clamps. The initial interference of 2 to 5mm the plane of the sealing bulb and sealing face of the seal seat is usually provided.

These seals may be used as top, bottom and side seals either by using them with water pressure acting them which is withdrawn before the gate is moved to reduce / eliminate friction load or they may be used with metal or flurocarbon film to achieve the same purpose. On heavy gates such seals may be well bottom seals where enough mechanical compression becomes available to make a good seal.
 

Double Bulb Seal These type of seals are used where the gate is required to seal from either upstream or downstream side. These are normally used for installation such as lock gates.

Z Type Seal
These seals are moulded or extruded to the shape required and the sealing effect is obtained partly due to initial interference with the embedded sealing plate and partly due to the deflection under load. To ensure even tightening of seals and thus to avoid waviness of the deal, brass spacer tubes may be used. This type of seal is used on gates on the cresis of dams and weirs.
23mm

These seals are used generally as bottom seals for all types of gates and the seal against bottom sealing plate. They require high initial compression loading for proper seating. The projection of bottom wedge seal shall vary from 2 to 5 mm depending upon the requirement and type of installation at the discretion of the designer. 

Rubber seals are metal cladded to reduce frictional force. These seals are less flexible than rubber seals. These seals are less effective to cover the deficiencies caused by misalignment in the embedded metal of the gate or variations in the gate fabrication. To overcome the drawback of reduced flexibility of fully cladded seals and to cover some degree of misalignment of either the gate or embedded parts, cladding may be provided on portion of the seal.

Rubber seals are metal cladded to reduce frictional force. These seals are less flexible than rubber seals. These seals are less effective to cover the deficiencies caused by misalignment in the embedded metal of the gate or variations in the gate fabrication. To overcome the drawback of reduced flexibility of fully cladded seals and to cover some degree of misalignment of either the gate or embedded parts, cladding may be provided on portion of the seal.