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seals may be used as top, bottom and side seals either by using them with water pressure acting them which is withdrawn before the gate is moved to reduce eliminate friction load or they may be used with metal or flurocarbon film to achieve the same purpose.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

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.

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seals may be used as top, bottom and side seals either by using them with water pressure acting them which is withdrawn before the gate is moved to reduce eliminate friction load or they may be used with metal or flurocarbon film to achieve the same purpose.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

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.