Instructions for Installation and Use of Mechanical Seals

• Security

1. Be sure to read this instruction manual before installation and use, paying special attention to safety precautions.
 
2. The use and operation of seals must be accompanied by appropriate protective facilities to prevent environmental contamination and potential harm to personnel caused by seal failure or malfunction.

• Use

Installation and operation personnel for mechanical seals must be trained and qualified individuals.

• Installation

(1) Pre-assembly Inspection Items:

1. It is essential to verify whether the installed mechanical seal is suitable for your specific operating conditions. When the temperature of the conveyed medium is excessively high or low, or when it contains impurity particles, is flammable, explosive, or toxic, appropriate measures such as sealing barriers, flushing, cooling, and filtration must be implemented.

2. Inspect the relevant hazard markings, verify installation and connection dimensions, and check the accuracy of critical axial and radial dimension tolerances on the shaft and housing. (The surface finish of the shaft or sleeve shall not exceed 1.6 microns, with shaft or sleeve tolerances set to h7. The runout of the sealing cavity end face relative to the pump shaft must be no more than 0.015 mm per 3 cm of bore diameter. Additionally, the radial runout of the shaft should remain within 0.1 mm, while the axial movement should not exceed 0.15 mm. The "O"-ring must feature a smooth, filleted transition at the corner area where it meets the sleeve end; the shaft shoulder should have a chamfer of 3 × 10°, and the end cover should include a chamfer measuring 2–2.5 × 20°.)

3. Carefully review the mechanical seal assembly drawing (refer to the product sample for standard series products) and ensure that the installation dimensions and tolerances of the mechanical seal meet the requirements.

(II) Precautions for Mechanical Seal Installation:

1. The installation environment for mechanical seals must be clean, free from dust, sand, and other particulates.

2. Sealing installation must be performed carefully and meticulously, avoiding the use of excessive force or any form of hammering.

3. The sealed installation workspace must be sufficiently spacious to allow personnel easy access for both operation and inspection. The working environment must be safe and free of any obstructions.

4. To reduce frictional resistance, a uniform layer of lubricant or grease may be applied to the shaft or sleeve at the sealing contact area. However, please note that when using EPDM rubber "O"-rings, avoid contact with mineral oils and greases altogether. Instead, water or silicone oil can be used for cleaning and lubrication. (Refer to Clause 9 for details on rubber bellows.)

5. The stationary "O"-ring is applied with water lubrication; external pressure is used to install the stationary ring.

6. When installing the double-layered PTFE coating, the outer seam must face away from the installation direction. Excessive bending of the PTFE can lead to failure. When installing the pure Teflon "O"-ring, sufficient time and gentle pressure should be applied to prevent scratches, as any damage could result in system failure.

7. Do not use lubricants on the sealing surfaces (a small amount of clean silicone oil may be applied in cases involving hard-to-hard mating surfaces). The assembly process should be carried out in a dry, dust-free, and clean working environment, and the sealing surfaces must remain free from contamination.

8. Mechanical seals whose spring rotation direction is related to the shaft's rotational direction (i.e., fixed-rotation seals): When viewed from the stationary ring toward the rotating ring, a clockwise-rotating shaft requires a right-handed spring, while a counterclockwise-rotating shaft needs a left-handed spring.

9. Mechanical seals featuring a rubber bellows seal series: The rubber bellows is pressed onto the shaft using water as a lubricant; grease or oil must not be used. Additionally, the sealing pressure can only be applied at the spring seat. (After installing the PGM1 model, ensure that the spring seat lugs are securely positioned against the end of the final spring coil to prevent potential rupture of the rubber bellows.)

10. When using screws to secure the mechanical seal onto the shaft (or sleeve) for transmission, select countersunk set screws with cutting edges to firmly fasten the rotating component onto the shaft. (For specific requirements, refer to the detailed seal installation drawing.)

11. Flexible graphite used as the auxiliary seal should be installed in a dry condition. Tighten it sequentially using axial bolts (avoid cross-tightening in the circumferential direction) to allow the flexible graphite to undergo sufficient secondary deformation.

12. When installing the stationary ring equipped with a flexible graphite sealing ring, ensure that the working surface is pressed firmly and maintain perpendicularity to the shaft axis within a tolerance of no more than 0.1 mm.

IV. Startup: A pre-startup inspection is mandatory

1. Have all the sealing system fittings been properly connected, and is the system operational?

2. Is the pump and seal chamber filled with liquid?

3. Has the air been completely evacuated from the sealed chamber?

4. The turning inspection should feel resistant, but there should be no signs of heaviness or jamming.

V. Running

1. Observe the operation of the sealing system.

2. Observe the sealing for any leakage.

3. Safety precautions must be observed during operation and observation to prevent personnel injuries caused by unexpected accidents.

VI. Machine Shutdown

During shutdown, the system must remain powered on continuously to help lower the temperature.

VII. Maintenance

Sealed operation requires no maintenance.

VIII. Disassembly

1. The removal of sealed components must be conducted with caution, employing necessary protective measures.

2. Ensure that the pump or equipment is depressurized.

3. Verify whether the pump or equipment has reached a temperature at which personnel can come into full contact.

4. Verify that the pump or equipment has been completely drained of liquid.

5. Assess the potential harm to personnel caused by residual liquids within the pump or equipment, and implement necessary safety measures.

6. Implement effective measures to prevent pollution of the site environment.

7. Perform correct disassembly according to the pump and mechanical seal structure.

9. Storage

1. Sealed products must be stored in a clean, room-temperature environment.

a. The storage area should be shielded from direct sunlight;

b. The storage area is free from ash, sand, and dust;

c. The storage area shall be free from ozone, radioactive materials, and corrosive gases.

d. Relative humidity in the storage area ≤ 65%;

e. Store at a temperature that is not too high; maintain room temperature and ensure proper ventilation.

2. The storage period of the "O"-rings is ≤ 2 years; expired "O"-rings must be replaced.

3. For products with a shelf life of two years, please inspect the sealing surfaces. If any deformation is found, repair it before reuse.