German V-COIL seals V-COIL models V-COIL prices

V-COIL seals are typical representatives of oil seals; the term "oil seal" generally refers to skeleton oil seals. The function of an oil seal is generally to isolate components requiring lubrication in transmission parts from the external environment, preventing lubricating oil leakage. The skeleton acts like reinforcing steel in concrete components, providing reinforcement and enabling the oil seal to maintain its shape and tension. According to structural form, they can be divided into single-lip skeleton oil seals and double-lip skeleton oil seals. The secondary lip of a double-lip skeleton oil seal serves a dust-proof function, preventing external dust, impurities, etc., from entering the machine interior. According to skeleton type, they can be divided into internally covered skeleton oil seals, externally exposed skeleton oil seals, and assembled oil seals. According to operating conditions, they can be divided into rotary skeleton oil seals and reciprocating skeleton oil seals. Used for gasoline engine crankshafts, diesel engine crankshafts, gearboxes, differentials, shock absorbers, engines, axles, and other locations.

Advantages of V-COIL seals

1) Oil seals have a simple structure and are easy to manufacture. Simple oil seals can be molded in one step; even the most complex oil seals do not have complicated manufacturing processes. Metal skeleton 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 little 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) Oil seals have a small installation footprint and small axial dimensions, are easy to process, and make machines compact. 4) Oil seals have 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 V-COIL seals

1) Preparation and precautions before startup: a, comprehensively check whether the mechanical seal, auxiliary devices, and piping are fully installed 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 take measures to eliminate it. If this is ineffective, disassemble, inspect, and reinstall. The static test pressure is generally 2~3 kg/cm². c, rotate the pump by hand in the direction of rotation to check if it moves lightly and evenly. If rotation is difficult or stuck, check whether assembly dimensions are incorrect or installation is improper. 2) Installation and shutdown: a, keep the seal chamber filled with liquid before startup. When conveying media that solidify, use steam to heat the seal chamber to melt the medium. Manual rotation must be performed before startup to prevent sudden startup from causing fracture of the soft ring. b, for mechanical seals using 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 pump startup, observe for a period. If continuous operation for 4 hours does not reduce the leakage, stop the pump for inspection. b, pump operating pressure should be stable, with pressure fluctuations not exceeding 1 kg/cm². c, avoid cavitation during pump operation to prevent dry friction and seal damage. d, regularly check the sealing condition. During operation, if leakage exceeds the standard (heavy oil no more than 5 drops/min, light oil no more than 10/min), and there is no improvement within 2-3 days, stop the pump to inspect the sealing device.

Technical requirements for V-COIL seal installation

Mechanical seals are high-precision mechanical components; correct installation and operation significantly impact their service life. We generally follow standards prescribed by the Ministry of Petrochemical Industry. The technical requirements for the pump installing the mechanical seal and the mating parts of the mechanical seal are as follows: 1) Shaft bending: maximum not greater than 0.05 mm; 2) Rotor runout: near the shaft sleeve at the dynamic ring seal ring, 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; (customary practice: end runout<0.05, radial runout<0.10) 5) The concentricity tolerance of the gland (static ring seat) and the sealing spigot relative to the shaft centerline is 0.05 mm; the perpendicularity tolerance of the surface contacting the gasket relative to the centerline is 0.03～0.05 mm. If requirements are not met, the seal chamber must be machined; 6) The ends of the shaft sleeve where the dynamic ring seal ring is installed, and the ends of the gland (or housing) where the static ring seal ring is installed, should be chamfered and smoothed. 7) Be careful when installing and removing mechanical seals; strictly prohibit using hammers and 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, coordinate during assembly and disassembly to avoid neglecting one side while attending to the other. 9) For mechanical seals that have been in operation, if gland loosening causes seal movement, the dynamic and static ring components must be replaced; do not simply retighten and continue use. Because after loosening, the original operating trajectory of the friction pair changes, easily compromising the sealing integrity of the contact surface.

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