German ARCA seals ARCA models ARCA prices

ARCA seals can be divided into two main categories: static seals and dynamic seals. Static seals mainly include three types: gasket seals, sealant seals, and direct contact seals. According to working pressure, static seals can be further divided into medium and low-pressure static seals and high-pressure static seals. Medium and low-pressure static seals commonly use gasket seals made of softer materials with wider widths, while high-pressure static seals use metal gaskets made of harder materials with very narrow contact widths. Dynamic seals can be divided into two basic types: rotary seals and reciprocating seals. Others are classified as contact seals and non-contact seals based on whether the seal contacts the components moving relative to it; they can also be divided into circumferential seals and face seals based on the seal and contact position, with face seals also known as mechanical seals. Centrifugal seals and spiral seals in dynamic sealing achieve sealing by imparting energy to the medium during machine operation, hence they are sometimes called power seals.

ARCA seals introduction

A mechanical seal is a shaft sealing device for rotating machinery, such as centrifugal pumps, centrifuges, reaction vessels, and compressors. Since the drive shaft passes through the inside and outside of the equipment, there is a circumferential gap between the shaft and the equipment. The medium inside the equipment leaks outward through this gap. If the pressure inside the equipment is lower than atmospheric pressure, air leaks into the equipment. Therefore, a shaft sealing device is required to prevent leakage. There are many types of shaft seals. Due to advantages such as low leakage and long service life, mechanical seals are the primary shaft sealing method for these equipment worldwide. Mechanical seals are also called face seals. National standards define them as: "a device that prevents fluid leakage by maintaining contact and relative sliding between at least one pair of faces perpendicular to the axis of rotation under the action of fluid pressure and the elastic force (or magnetic force) of a compensation mechanism, in conjunction with auxiliary seals."

ARCA seals structure composition

1) Main components: rotating ring, stationary ring, cooling device, and compression spring (depending on the specific equipment). 2) Auxiliary sealing elements: O-rings (including O-shaped, X-shaped, U-type, wedge-shaped, rectangular flexible graphite, PTFE-covered rubber O rings, etc.). 3) Elastic compensation mechanism: springs, thrust rings, spring seats, keys, or various screws. 4) Classification: single face, double face; balanced, unbalanced; arbitrary rotation direction, fixed rotation direction.

ARCA seals installation technical requirements

Mechanical seals are high-precision mechanical components, and their correct installation and operation significantly impact their service life. We generally follow the standards specified by the Ministry of Petrochemical Industry. The technical requirements for the pump installing the mechanical seal and the parts mating with the mechanical seal are as follows: 1) Shaft runout: maximum not greater than 0.05 mm; 2) Rotor wobble: near the shaft sleeve at the rotating ring seal location, not greater than 0.06 mm; 3) Axial shaft movement must not exceed ±0.5 mm; if a shaft sleeve is present, the shaft sleeve must not be loose; 4) Coupling alignment error: for gear couplings, not greater than 0.08–0.10 mm (P2008C); for elastic couplings, not greater than 0.05–0.06 mm; (common practice: axial runout<0.05, radial runout<0.10) 5) Concentricity tolerance of the gland (stationary ring seat) and the sealing spigot relative to the shaft centerline: 0.05 mm; perpendicularity tolerance of the surface contacting the gasket relative to the centerline: 0.03–0.05 mm. If requirements are not met, the seal chamber must be machined; 6) The end of the shaft sleeve where the rotating ring seal is installed, and the end of the gland (or housing) where the stationary ring seal is installed, should be chamfered and smoothed. 7) Be careful when installing and removing mechanical seals. Do not use hammers or flat chisels to avoid damaging seal elements. If scale prevents removal, clean thoroughly before disassembly. 8) If mechanical seals are used on both ends of the pump, take care during assembly and disassembly to avoid neglecting one side while attending to the other. 9) For mechanical seals that have been in operation, if the gland loosens causing the seal to shift, the rotating and stationary ring parts must be replaced. Do not simply retighten and continue using them. Because after loosening, the original operating trajectory of the friction pair changes, easily compromising the sealing integrity of the contact surfaces.

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