German peter post seals, peter post models, peter post prices

peter post seals are sealing devices installed to prevent leakage between the pump shaft and the housing. Common types of shaft seals 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 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 include packing seals, mechanical seals, and power seals.

Advantages of peter post seals

1) Oil seals have a simple structure and are easy to manufacture. Simple oil seals can be molded in one step; even for the most complex oil seals, the manufacturing process is not complicated. Metal-cased oil seals only require processes such as stamping, bonding, inlaying, and molding to combine metal and rubber into the required oil seal. 2) Oil seals are lightweight and consume less material. Each oil seal is a combination of thin-walled metal and rubber components, consuming very little material, so each oil seal is very light. 3) The installation space for oil seals is small, with small axial dimensions, making them easy to machine and allowing for compact machine design. 4) Oil seals offer good sealing performance and a long service life. They have certain adaptability to machine vibration and main shaft eccentricity. 5) Oil seals are easy to disassemble and convenient to inspect. 6) Oil seals are inexpensive.

Precautions for peter post seals

1) Preparation and precautions before startup: a, comprehensively check whether the mechanical seal, as well as auxiliary devices and pipeline installations, are complete and comply with technical requirements. b, 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 static pressure test pressure is generally 2~3 kg/cm². c, 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. 2) Installation and shutdown: a, keep the seal chamber filled with liquid before startup. When transporting media that solidify, use steam to heat the seal chamber to melt the media. Manual rotation must be performed before startup to prevent sudden startup from causing the soft ring to fracture. b, for mechanical seals utilizing an external seal oil system, start the seal oil system first. Stop the seal oil system last after shutdown. c, do not immediately stop the cooling water for the seal oil chamber and face seal after stopping a hot oil pump. Wait until the oil temperature at the face seal drops below 80 degrees before stopping the cooling water to avoid damaging seal components. 3) Operation: a, if slight leakage occurs after the pump starts, observe for a period of time. If the leakage does not decrease after continuous operation for 4 hours, stop the pump for inspection. b, the pump operating pressure should be stable, with pressure fluctuations not exceeding 1 kg/cm². c, during pump operation, avoid cavitation to prevent dry friction of the sealing faces and seal damage. d, frequently check the sealing condition. During operation, if leakage exceeds the standard (no more than 5 drops/min for heavy oil, no more than 10/min for light oil), and there is no improvement within 2-3 days, stop the pump to inspect the sealing device.

Maintenance of peter post seals

1) Control of shaft seal pressure: High shaft seal pressure can easily cause steam blowout from the shaft seal, leading to water ingress into the oil and deterioration of turbine oil quality. Excessively high shaft seal pressure will trigger the safety valve of the equalizing tank, 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 heating at the shaft end gland and rotor gland section can cause localized stress concentration, resulting in certain deformation. This may change the clearance between the rotor and the cylinder, increase shaft seal steam leakage and differential expansion, and potentially cause serious rubbing between stationary and rotating parts. When the shaft seal temperature is too low, the shaft end gland and rotor gland section are cooled, similarly causing localized stress concentration, changing the clearance between the cylinder and the rotor, increasing shaft end steam leakage, 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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