German Rehau seals Rehau models Rehau prices

Rehau seals are sealing devices installed to prevent leakage between the pump shaft and the housing. Common shaft seal types include packing seals, mechanical seals, and power seals. The shaft seal of a reciprocating pump is usually a packing seal. When transporting media where leakage is not permitted, a diaphragm reciprocating pump can be used. The shaft seals of rotary pumps (including vane pumps, rotor pumps, etc.) mainly consist of packing seals, mechanical seals, and power seals. The shaft seal of a reciprocating pump is usually a packing seal. When transporting media where leakage is not permitted, a diaphragm reciprocating pump can be used. The shaft seals of rotary pumps (including vane pumps, rotor pumps, etc.) mainly consist of packing seals, mechanical seals, and power seals.

Rehau seal features

1) No need to measure the seal working length during installation; 2) The shaft can be adjusted at any time; 3) No leakage occurs during startup because the seal has been pre-tested; 4) During installation, only the seal cover bolts need to be tightened, making it easy to ensure assembly quality; 5) Protects the sealing surface from contamination by debris or damage due to operational errors before installation or startup; 6) Can be readjusted after thermal expansion of the machinery; 7) Self-centering through fit; 8) Easy to remove the seal for cleaning and inspection without disassembling the pump equipment. The API682 standard recommends cartridge mechanical seals for all mechanical seals.

Rehau seal startup preparation

1) Comprehensively check whether the mechanical seal, auxiliary devices, and pipeline installations are complete and comply with technical requirements. 2) Perform a static pressure test on the mechanical seal before startup to check for leakage. If there is significant leakage, identify the cause and eliminate it. If this is ineffective, disassemble, inspect, and reinstall. The general static test pressure is 2~3 kg/cm². 3) Rotate the pump according to its direction of rotation to check if it moves lightly and evenly. If rotation is difficult or stuck, check whether the assembly dimensions are incorrect and whether the installation is reasonable.

Rehau seal maintenance

1) Control of shaft seal pressure: High shaft seal pressure can easily cause steam venting at the shaft seal, leading to water ingress into the oil and deterioration of turbine oil quality. Excessively high shaft seal pressure will trigger the action of the equalizing box safety valve, wasting working fluid and damaging equipment. Too low shaft seal pressure may cause a drop in unit vacuum, allowing cold air to enter the shaft seal or even the cylinder, causing cooling of the shaft seal section or inside the cylinder, which seriously threatens equipment safety. 2) Impact of abnormal shaft seal temperature on the unit: When the shaft seal temperature is too high, especially before unit startup, excessive heat causes intense heating at the shaft end steam seal and the rotor steam seal section, resulting in local stress concentration and certain deformation. This may change the clearance between the rotor and the cylinder, increase steam leakage at the shaft seal, increase differential expansion, and potentially cause serious rubbing between stationary and rotating parts. When the shaft seal temperature is too low, the shaft end steam seal and rotor steam seal section are cooled, also producing local stress concentration, changing the clearance between the cylinder and the rotor, increasing steam leakage at the shaft end, and decreasing differential expansion. Too low shaft seal temperature may also cause water carryover in the shaft seal supply steam, leading to water hammer in the shaft seal supply pipeline. In severe cases, this can cause water ingress into the turbine.

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