What is the difference between DC type thrustless compensator and oil-filled sleeve compensator

DC type thrustless compensator is called piston automatic balance compensator, outside the core tube and core tube fused into one.1. The cross-sectional area of the piston (i.e. ring area) is equal to the cross-sectional area of the core tube. The axial pressure of the medium pressure on the pipe is F1.F2. equal in size and opposite in direction. These two forces act on the left and right connecting pipes of the sleeve compensator respectively. If they cannot be balanced, they should be borne by the fixed supports on the left and right pipes respectively. The medium in the piston body is connected to the medium in the pipe through hole 2, and the medium pressure also acts on the annular piston 1. Because the piston area is equal to the pipe cross-sectional area, F1ˊ=F1,F2ˊ is connected to the right casing through the connecting rod 3. F1ˊ in the piston body F2ˊ.F1ˊ which is a pair of action and reaction force, equal in size and opposite in direction, F2ˊ=F2,F1=F1ˊ, so that the two pairs of action forces are equal and opposite in direction, acting in a straight line, balancing the axial force generated by the medium pressure, no longer acting on the two ends of the support.
The thrustless compensator uses Pascal's theory in fluid mechanics, and cleverly utilizes a sealed annular air chamber in the design structure. This chamber has two annular pressurized surfaces, one is the fixed chamber end surface, and the other is the shoulder annular surface of the telescopic tube sealed inside the chamber, which can be moved with the telescopic tube. This movable annular pressurized area is exactly the same as the expansion cross-sectional area. When the compensator works, the pressure on the annular surface under the medium pressure is equal to the pressure on the cross-sectional area of the expansion tube in the opposite direction, so the two pressures cancel each other out. In this way, in the designed bracket, only the pressure of the compensating and fixed bracket is considered.
Oil-injected sleeve compensators are called pipe expansion joints. Pipe expansion joints are compensation devices for thermal fluid pipes, mainly for auxiliary straight pipes. Suitable for hot water . Steam. Oil medium, through the sliding sleeve to the jacket for sliding movement, can achieve the compensation of thermal expansion.
Oil-injected sleeve compensator is suitable for medium engineering pressure ≤ 2.5MPa, medium temperature -190℃~600℃. Oil-injected sleeve compensator adopts new sealing material flexible graphite ring, high strength, small friction coefficient (0.04~0.15), no aging, good effect, easy maintenance and other characteristics.