A fluid shut-off device for high temperature employments, for example in the petrochemical field, comprising: - a valve body which extends axially along a body axis (Z) between two opposite openings for the inlet and outlet of the fluid, the valve body being provided, at each end thereof delimiting a respective opening, with connection means to a respective joining member to be joined to a fluid inlet or outlet duct; - a shutter rotatably placed in the valve body between the two inlet/outlet openings , the shutter being crossed by an axial passageway suitable to put the two opposite openings into fluid communication and being rotatable between a closed position, in which it prevents the passage of the fluid from one opening to the other opening of the valve body , and an open position, in which it allows the passage of the fluid between the two openings of the valve body ; - two shutter seats which rotatably support the shutter , wherein each shutter seat is supported by or is integral with a respective drawer ; wherein each drawer is elastically affected by a respective elastic compensation member which applies to the drawer a compensation pressure directed towards the shutter , and wherein a head is inserted, with shape and/or force coupling, into each of the inlet/outlet openings of the valve body , the head defining an axial abutment for a respective elastic compensation member , wherein each head has an outer side wall which sealingly engages an inner side wall of the valve body , is axially crossed by a head opening for the passage of the fluid, and is inserted into the respective opening without engaging said connection means with the joining member , characterized in that the outer wall of the head and the inner side wall of the valve body are connected to each other by means of bayonet coupling . - a valve body which extends axially along a body axis (Z) between two opposite openings for the inlet and outlet of the fluid, the valve body being provided, at each end thereof delimiting a respective opening, with connection means to a respective joining member to be joined to a fluid inlet or outlet duct; - a shutter rotatably placed in the valve body between the two inlet/outlet openings , the shutter being crossed by an axial passageway suitable to put the two opposite openings into fluid communication and being rotatable between a closed position, in which it prevents the passage of the fluid from one opening to the other opening of the valve body , and an open position, in which it allows the passage of the fluid between the two openings of the valve body ; - two shutter seats which rotatably support the shutter , wherein each shutter seat is supported by or is integral with a respective drawer ; wherein each drawer is elastically affected by a respective elastic compensation member which applies to the drawer a compensation pressure directed towards the shutter , and wherein a head is inserted, with shape and/or force coupling, into each of the inlet/outlet openings of the valve body , the head defining an axial abutment for a respective elastic compensation member , wherein each head has an outer side wall which sealingly engages an inner side wall of the valve body , is axially crossed by a head opening for the passage of the fluid, and is inserted into the respective opening without engaging said connection means with the joining member , characterized in that the outer wall of the head and the inner side wall of the valve body are connected to each other by means of bayonet coupling . <EOS>