Chinese Hydraulic Screw-in Cartridge valve manufacturer AAK often receives various questions from overseas customers, some of which even come from college students conducting academic research. Today, we will once again introduce the main materials used for seals in hydraulic screw-in cartridge valves, as well as their respective characteristics:
1. Rubber Sealing Materials
1) Nitrile rubber (NBR)
- Excellent oil resistance, suitable for conventional hydraulic oil environments, with a working temperature range of -40 â?? to+120 â??.
- Mainly used in static sealing scenarios, such as O-rings and some combination seals
2) Fluororubber (FKM)
- High temperature resistance (up to 200 â??), chemical corrosion resistance, suitable for hydraulic oil containing phosphate esters or highly corrosive media.
- Commonly used in high-pressure systems or extreme temperature environments.
3) Silicone rubber (VMQ)
- Outstanding cold resistance (-70 â?? to+200 â??), but low mechanical strength, only suitable for static sealing
2. Polymer Sealing Materials
1) Polytetrafluoroethylene (PTFE)
- Extremely low friction coefficient, good self-lubricating properties, strong corrosion resistance, suitable for high-speed or chemically corrosive environments.
- Often used as a filling material in conjunction with rubber, or in combination with seals (such as Glay rings, seals).
2) Polyurethane (PU)
- High wear resistance and anti extrusion strength, suitable for high-pressure reciprocating motion seals (such as Y-shaped rings, U-shaped rings), working temperature -30 â?? to+100 â??.
3) Nylon (PA)
- Oil resistant and wear-resistant, used for non direct sealing components such as guide rings and support rings, with a working temperature of -40 â?? to+120 â??.
3. Metal Sealing Materials
Stainless steel/copper alloy
- Used for extreme high pressure (>32MPa) or high temperature (>450 â??) scenarios, achieving metal to metal sealing through precision machining.
4. Composite Sealing Materials
Clip on rubber+rubber (lace ring) or PTFE+rubber (Glay ring/Steller seal)
- Combining the elasticity of rubber with the wear resistance of PTFE/sandwich material, suitable for high-pressure dynamic sealing (such as valve spool and valve cage).
Selection Suggestions
- Normal working conditions: Priority should be given to using nitrile rubber or polyurethane.
- High temperature/corrosive environment: Fluorine rubber or PTFE composite materials are better.
- Ultra high pressure scenario: requires metal seals or combined sealing structures.
Sealing Material
Rock Metal offers a wide selection of sealing materials in silicon carbide, carbon graphite, tungsten carbide, ceramic, rubber and stainless steel, etc. View our variety of sealing types equipped to handle the vast majority of sealing solutions and available for nearly all applications.
Tungsten carbide
Carbon graphite
Silicon carbide
Ceramic
Stainless steel
Component Mechanical Seal --- Rock Metal Seal have managed to successfully install thousands of seals worldwide.
Component mechanical seals are composed of separate rotary and stationary parts. Unlike cartridge seals, component seals are not pre-assembled and require skilled technicians to install them. Incorrect installation of seal faces, O-rings, and seal axial setting on the pump shaft will result in reduced seal life or in some cases, immediate seal failure.
Advantages of Component Mechanical Seals
Reduced expenses on initial seal purchase
Reduced spares costs as the individual components can be stocked vs. the entire seal
Superior adaptability to very small pumps
Disadvantages of Component Mechanical Seals
The major disadvantage for component mechanical seals are their susceptibility to damage. Component mechanical seals usually have exposed parts that are more susceptible to damage during transportation or installation.
Further, component seals require precise measurements during installation to prevent seal failure. Properly installing this type of seal requires more operator time and thus a higher cost to install or re-install after a repair.
Rock Metal offers a wide range of standard cartridge seals that are versatile and easy to install, suit a wide range of duties and are commonly used in applications in the chemical, pulp & paper, power, food & beverage, mining, water/wastewater and general industries.
Cartridge mechanical seal is a collection of all the parts of the mechanical seal, such as the rotary ring, stationary ring, spring, secondary seal, gland, etc. The rotating and stationary parts of this seal are pre-assembled into a whole before installation. After inspection and pressure test, they are installed in the seal cavity, fixed to the pump shaft with set screws, tighten the seal gland bolts, remove the assembly positioning plate, and the mechanical seal can be in a parallel working state and put into operation. This is not only easy to assemble but also ensures the assembly quality.
Advantages of Cartridge Mechanical Seals
1. All parts of the seal are assembled into a whole, with a compact structure.
2. The seal is pre-assembled into a whole, which ensures the working height of the spring, is conducive to the operation of the seal under the designed working conditions, and it is safer. It eliminates measurement errors and improves the reliability of the seal.
3. The seal is easy and quick to install on site, without the need for on-site debugging (such as springs, sealing surfaces, etc.), which reduces the labor intensity of maintenance workers. It reduces installation human errors and reduces the occurrence of failures.
4. Prevent dust from entering or damaging the sealing surface
5. Protect customer shafts/sleeves
6. Since the seal cartridge device has an internal sleeve, a balanced seal can be operated without a customized shaft.
7. Maintenance saves time and effort, and no compression adjustment is required
Disadvantages of Cartridge Mechanical Seals
The disadvantage of the cartridge mechanical seal is the higher initial cost and the additional required space.
To design a ready-to-go cartridge seal much information is necessary upfront.
When the fire occurs, the fireproof expansion sealing strips automatically expand, sealing the gaps in the door gaps, blocking the air circulation between the two spaces, effectively preventing the smoke from being exposed to the fire in the early stage of the fire, and controlling the fire spread.
Application Fire-proof door, wooden door, community security door, heating furnace, heat sink, building pipe wells etc.
Material : Expandable graphite and Thermoplastic element composition
Due to its excellent elasticity, performance of insulation, plasticity, insulate air&water, rubber products are widely used in industries, agriculture, national defence, transportation, mechanism, medical industries and our daily life.
We can make the rubber products according to your provided drawings and samples.
Oil seal
We are a manufacturer and exporter for oil seals in china. Now, our products are
Exported to many countries and areas, such as the middle east, north america, africa and south america.
Our products are suitable for automobiles, such as toyota, nissan and so on. If you
Are interested in these, please contact us.
Features:
1) materials: nbr, plastic, viton, silicon, ptfe
2) types: tc, tb, vc, vb, htc, tcl, tcrmore products from this supplier
Oil seal
We are a manufacturer and exporter for oil seals in china. Now, our products are
Exported to many countries and areas, such as the middle east, north america, africa and south america.
Our products are suitable for automobiles, such as toyota, nissan and so on. If you
Are interested in these, please contact us.
Features:
1) materials: nbr, plastic, viton, silicon, ptfe
2) types: tc, tb, vc, vb, htc, tcl, tcrmore products from this supplier
Mechanical seals
We would like to introduce our company as one of leading manufacture for mechanical seals. E can also produce various kinds of good quality of mechanical seals of john crane, aes and burg mann. What's more, we also can design every conceivable mechanical seals according to your requests.
Mechanical Seal For Grunfos Pump Condition:
GRUNFOS PUMP COMPONENTS
It issuitable to grunfos pumps:CR(N)10,15,20.
Single spring o-ring . ,achined mounted semi-cartridge seals with threaded
HEX-HEAD suit for CRN &CR 1,3,15, 20 series pumps.
Size: 12mm, 16mm
Pressure: Up to 2.5Mpa
Speed: Up to 25m/s or 80ft/s
Temperature: -30deg C to 200deg C (Depending onmaterials)
Mediums: Water, oil and other low corrosionmediums
single spring o ring mounted semi cartridge seals with threaded hex-heads to suit
Grunfos CR&CRI series centrifugal pumps. CR1, CR3, CRN1, CRN15,
Balanced cartridge o-ring seal unit with rigid torque trasmission system. This seal
type is assembled in a cartridge unit which makes repacement safe and easy.
This seal arrangement incorporates a clean barrier fluid with a higher pressure the
then pumped medium.
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