Oil field Equipment,Petrochemical Equipment,Instrument,China Manufacturers

  • Classification and type selection of seals
  • Type selections of seals
  • The basic requirements for seals are as follows: good sealing performance, safe and reliable seal, long service life, compact structure, simple mating system, convenient manufacture and maintenance and low cost. Besides, the most of sealing components are quick-wear parts, so strong interchange abilities, standardization and serialization are necessary. The selections of materials and types for sealing components should be based on the related working conditions (which are static or dynamic) and working environment (including temperature and pressure, etc) and the properties of working media. 
                                                              Characteristics of common seals 

    Seal type
    Service condition
    Pressure resistance
    High-speed resistance
    Heat resistance
    Cold resistance
    Durability
    Application
    Remarks
    Reciprocating motion
    Rotation
    Packing seal
    Good
    Good
    Good
    Good
    Good
    Able
    Able
    Pump, water turbine, valve, high-pressure autoclave
    Spiral wound packing, braided packing or molded packing can be used.
    O-ring seal
    Good
    Able
    Good
    Good
    Good
    Able
    Able
    Piston seal
    Widely used as static seal with good durability.
    Y-ring seal
    Excellent
     
    Excellent
    Good
    Good
    Able
    Able
    Piston seal
    Sometimes used as a static seal.
    Mechanical seal
     
    Excellent
    Excellent
    Excellent
    Excellent
    Excellent
    Excellent
    Pump, water turbine, valve, high-pressure autoclave, compressor, agitator
    Different materials including metal bellows seal can be combined.
    Oil seal
    (Able)
    Excellent
    Able
    Excellent
    Able
    Able
    Able
    Bearing seal
    Can be used with other sealing components to prevent dust.
    Sliding ring seal
    Able
    Good
    Excellent
    Excellent
    Excellent
    Excellent
    Excellent
    Water turbine, steam turbine
    Generally adopts graphite as sliding ring.
    Labyrinth seal
    Excellent
    Excellent
    Excellent
    Excellent
    Excellent
    Excellent
    Excellent
    Steam turbine, pump, compressor
    Suitable for high speed, but not for low speed.
    Floating ring seal
    Able
    Good
    Excellent
    Excellent
    Excellent
    Excellent
    Excellent
    Pump, compressor
     
    Centrifugal seal
    ×
    Excellent
    Good
    Good
    Good
    Good
    Excellent
    Pump
     
    spiral seal
    ×
    Excellent
    Good
    Good
    Good
    Good
    Excellent
    Pump
     
    Magnetic fluid seal
    ×
    Excellent
    Excellent
    Excellent
    Good
    Excellent
    Excellent
    Compressor
    Only suitable for gas media.

     
    Types and application ranges of dynamic seals

    Seal type
    Vacuum(absolute pressure) MPa
    Pressure (gauge pressure) MPa
    Working temperature℃
    Linear velocity m.s
    Leakage rate ml.h
    Service
    life
    Application example
    Contact type
    1.33×10
    31.38
    -240 600
    20
    10~1000
     
    Centrifugal water pump, plunger pump, valve stem seal
     
     
     
     
    Molded packing
    Tight type
    1.33×10
    98.07
    -45~230
    10
    0.001~0.1
    ~1year
    Hydraulic cylinder
    Lip type
     
    0.1~10
    Rubber seal
    Oil seal
     
    0.29
    -30~150
    12
    3~6
    months
    for bearing
    Dust-free oil seal
     
    Packing seal
    Reciprocating seal
     
    294.2
    -45~400
     
    3 months
    ~1 year
    Piston rod seal
    Rotating seal
     
     
    6 months
    ~1 year
    Sealing oil for main bearing of aircraft engine
    Mechanical seal
    Normal seal
    1.33×10
    7.85
    -196~400
    30
    0.1~150
    6 months
    ~1 year
    Centrifugal pumps for chemical plant, power plant and refinery
    Liquid film
     
    31.38
     
     
    100~5000
     1 year
    Large-scale pump, turbine compressor
    Gas film
     
    1.96
    No limit
    No limit
     
    Aircraft engine
    Labyrinth seal
    1.33×10
    19.61
    600
    No limit
    Large
    Above
    3 years
    Steam turbine, gas turbine, piston compressor
    Floating ring seal
    Liquid film
     
    31.38
     
    80
    Inner leakage
    Above
     1 year
    Pump, chemical turbine
    Gas
     
    0.98
    -30~150
    70
    <8300
    About
     1 year
    Oxygen generator
    Non-
    contact type
    Power
    seal
    Centrifugal seal
    Back impeller
    1.33×10
    0.25
    0~50
    30
     
     
    Slurry pump
    Oil slinger
    Oil seal
     
    0
    No limit
    No limit
     
     
    Sealing oil and preventing dust for bearing
    Dust-proof
     
    Spiral seal
    Spiral seal
    1.33
    ×10
    2.45
    -30~100
    30
     
    Non-
    wearing parts
    Sealing oil for bearing, Sealing oil for blower
     
    70
    Auxiliary bearing of boiler feed pump
     
     
    Magnetic fluid seal
    1.33
    ×10
    4.12
    -50~90
    70
     
     
     

     
     
  •  Related Supplier Directory

  •  Recommeded Suppliers

List of all Products: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
About Us  |  Contact Us  |  Help  |  Terms of Use  |  Privacy Policy  |  Advertise  |   Site Map | Friendly Link | China Map | 用户协议
Your use of this website is subject to, and constitutes acknowledgement and acceptance of our Terms of Use.
Copyright © 2008-2014 china-ogpe.com. All rights reserved. 粤ICP备09038230号
安全联盟