| Customization: | Available |
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| Structure: | Single End |
| Pressure: | High Pressure Mechanical Seals |
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(1)Features
For unstepped shafts
Rotating bellows
Single seal
Balanced
Independent of direction of rotation
Metal bellows
(2)Advantages
For extreme temperature ranges
No dynamically loaded O-Ring
Self cleaning effect
Short installation length possible
Pumping screw for highly viscous media available
(dependant on direction of rotation).
(3)Operating range (see note on page 1)
Shaft diameter: d1 = 16 ... 100 mm (0.63" ... 4")
Externally pressurized: p1 = ... 25 bar (363 PSI)
Internally pressurized:
p1 < 120 °C (248 °F) 10 bar (145 PSI)
p1 < 220 °C (428 °F) 5 bar (72 PSI)
Temperature: t = -40 °C ... +220 °C (-40 °F ... +428 °F),
stationary seat lock necessary.
Sliding velocity: vg = 20 m/s (66 ft/s)
(4)Materials
Seal face: Carbon graphite antimony impregnated (A),
Silicon carbide (Q12)
Seat: Silicon carbide (Q1)
Bellows: Inconel® 718 hardened (M6),
Hastelloy® C-276 (M5)
Metal parts: CrNiMo steel (G), Duplex (G1),
Hastelloy® C-4 (M)
(5)Standards and approvals
EN 12756
(6)Recommended applications
Refining technology
Power plant technology
Chemical industry
Hot media
Cold media
Highly viscous media
Pumps
Special rotating equipment
(7)Item Part no. to DIN 24250 Description
1.1 472/481 Seal face with
bellows unit
1.2 412.1 O-Ring
1.3 904 Set screw
2 475 Seat (G9)
3 412.2 O-Ring
(8)Product variants
MFL90N
Shaft diameter: d1 = 20 ... 100 mm (0.79" ... 4")
Internally pressurized: p1 = ... 16 bar (232 PSI),
stationary seat lock necessary.
Externally pressurized: p1 10 bar (145 PSI),
Temperature: t = -40 °C ... +220 °C (-40 °F ... +428 °F)
Sliding velocity: vg = 20 m/s (66 ft/s)
MFL85P/MFL90P
Version with pumping ring. Dependent on direction of
rotation. Can be retrofitted.
MFL85F
Dimensions, items and description as for MFL85N,
but with pumping screw (item no. 1.4).
Dependent on direction of rotation!
The pumping screw can be retrofitted.
(9)Seat alternative
Dimensions in mm
| d1 | d3 | d6 | d7 | d8 | ds | L1k | L3 | L5 | L6 | L8 | L9 | L18 | L19 | b | s |
| 16 | 30.0 | 23.0 | 27.0 | 3.0 | 38.0 | 42.5*) | 32.5 | 1.5 | 4.0 | 17.5 | 10.0 | - | - | 1.6 | 9.0 |
| 18 | 32.0 | 27.0 | 33.0 | 3.0 | 39.0 | 42.0 | 30.5 | 2.0 | 5.0 | 14.0 | 11.5 | 15.0 | 7.0 | 1.6 | 10.0 |
| 20 | 33.5 | 29.0 | 35.0 | 3.0 | 41.0 | 42.0 | 30.5 | 2.0 | 5.0 | 14.0 | 11.5 | 15.0 | 7.0 | 1.6 | 10.0 |
| 22 | 36.5 | 31.0 | 37.0 | 3.0 | 44.0 | 42.0 | 30.5 | 2.0 | 5.0 | 14.0 | 11.5 | 15.0 | 7.0 | 1.6 | 10.0 |
| 24 | 39.0 | 33.0 | 39.0 | 3.0 | 47.0 | 40.0 | 28.5 | 2.0 | 5.0 | 19.5 | 11.5 | 15.0 | 7.0 | 1.6 | 8.2 |
| 25 | 39.6 | 34.0 | 40.0 | 3.0 | 48.0 | 40.0 | 28.5 | 2.0 | 5.0 | 19.5 | 11.5 | 15.0 | 7.0 | 1.6 | 8.5 |
| 28 | 42.8 | 37.0 | 43.0 | 3.0 | 51.0 | 42.5 | 31.0 | 2.0 | 5.0 | 19.5 | 11.5 | 15.0 | 7.0 | 1.6 | 9.0 |
| 30 | 45.0 | 39.0 | 45.0 | 3.0 | 53.0 | 42.5 | 31.0 | 2.0 | 5.0 | 19.5 | 11.5 | 15.0 | 7.0 | 1.6 | 8.5 |
| 32 | 46.0 | 42.0 | 48.0 | 3.0 | 55.0 | 42.5 | 31.0 | 2.0 | 5.0 | 19.5 | 11.5 | 15.0 | 7.0 | 1.6 | 9.2 |
| 33 | 48.0 | 42.0 | 48.0 | 3.0 | 56.0 | 42.5 | 31.0 | 2.0 | 5.0 | 19.5 | 11.5 | 15.0 | 7.0 | 1.6 | 9.2 |
| 35 | 49.2 | 44.0 | 50.0 | 3.0 | 58.0 | 42.5 | 31.0 | 2.0 | 5.0 | 19.5 | 11.5 | 15.0 | 7.0 | 1.6 | 9.5 |
| 38 | 52.3 | 49.0 | 56.0 | 4.0 | 61.0 | 45.0 | 31.0 | 2.0 | 6.0 | 22.0 | 14.0 | 16.0 | 8.0 | 1.6 | 9.2 |
| 40 | 55.5 | 51.0 | 58.0 | 4.0 | 64.0 | 45.0 | 31.0 | 2.0 | 6.0 | 22.0 | 14.0 | 16.0 | 8.0 | 1.6 | 9.2 |
| 43 | 57.5 | 54.0 | 61.0 | 4.0 | 67.0 | 45.0 | 31.0 | 2.0 | 6.0 | 22.0 | 14.0 | 16.0 | 8.0 | 1.6 | 9.2 |
| 45 | 58.7 | 56.0 | 63.0 | 4.0 | 69.0 | 45.0 | 31.0 | 2.0 | 6.0 | 22.0 | 14.0 | 16.0 | 8.0 | 1.6 | 9.5 |
| 48 | 61.9 | 59.0 | 66.0 | 4.0 | 72.0 | 45.0 | 31.0 | 2.0 | 6.0 | 22.0 | 14.0 | 16.0 | 8.0 | 1.6 | 9.2 |
| 50 | 65.0 | 62.0 | 70.0 | 4.0 | 74.0 | 47.5 | 32.5 | 2.5 | 6.0 | 23.0 | 15.0 | 17.0 | 9.5 | 1.6 | 10.5 |
| 53 | 68.2 | 65.0 | 73.0 | 4.0 | 77.0 | 47.5 | 32.5 | 2.5 | 6.0 | 23.0 | 15.0 | 17.0 | 9.5 | 1.6 | 10.5 |
| 55 | 70.0 | 67.0 | 75.0 | 4.0 | 80.0 | 47.5 | 32.5 | 2.5 | 6.0 | 23.0 | 15.0 | 17.0 | 9.5 | 1.6 | 10.0 |
| 58 | 71.7 | 70.0 | 78.0 | 4.0 | 83.0 | 52.5 | 37.5 | 2.5 | 6.0 | 23.0 | 15.0 | 18.0 | 10.5 | 3.0 | 14.0 |
| 60 | 74.6 | 72.0 | 80.0 | 4.0 | 85.0 | 52.5 | 37.5 | 2.5 | 6.0 | 23.0 | 15.0 | 18.0 | 10.5 | 3.0 | 14.0 |
| 63 | 79.0 | 75.0 | 83.0 | 4.0 | 88.0 | 52.5 | 37.5 | 2.5 | 6.0 | 23.0 | 15.0 | 18.0 | 10.5 | 3.0 | 14.0 |
| 65 | 84.1 | 77.0 | 85.0 | 4.0 | 95.0 | 52.5 | 37.5 | 2.5 | 6.0 | 23.0 | 15.0 | 18.0 | 10.5 | 3.0 | 14.0 |
| 68 | 87.3 | 81.0 | 90.0 | 4.0 | 96.0 | 52.5 | 34.5 | 2.5 | 7.0 | 26.0 | 18.0 | 18.5 | 11.0 | 1.6 | 10.0 |
| 70 | 87.3 | 83.0 | 92.0 | 4.0 | 96.0 | 60.0 | 42.0 | 2.5 | 7.0 | 26.0 | 18.0 | 19.0 | 11.5 | 3.0 | 17.0 |
| 75 | 95.0 | 88.0 | 97.0 | 4.0 | 104.0 | 60.0 | 42.0 | 2.5 | 7.0 | 26.0 | 18.0 | 19.0 | 11.5 | 3.0 | 16.0 |
| 80 | 98.4 | 95.0 | 105.0 | 4.0 | 109.0 | 60.0 | 41.8 | 3.0 | 7.0 | 26.2 | 18.2 | 19.0 | 11.5 | 3.0 | 16.0 |
| 85 | 104.7 | 100.0 | 110.0 | 4.0 | 114.0 | 60.0 | 41.8 | 3.0 | 7.0 | 26.2 | 18.2 | 19.0 | 11.5 | 3.0 | 16.0 |
| 90 | 111.0 | 105.0 | 115.0 | 4.0 | 119.0 | 65.0 | 46.8 | 3.0 | 7.0 | 26.2 | 18.2 | 20.5 | 13.0 | 3.0 | 21.0 |
| 95 | 114.0 | 110.0 | 120.0 | 4.0 | 124.0 | 65.0 | 47.8 | 3.0 | 7.0 | 25.2 | 17.2 | 20.5 | 13.0 | 3.0 | 21.0 |
| 100 | 117.4 | 115.0 | 125.0 | 4.0 | 129.0 | 65.0 | 47.8 | 3.0 | 7.0 | 25.2 | 17.2 | 20.5 | 13.0 | 3.0 | 20.0 |
| *) Installation length is longer than l1k specified by EN 12756 | |||||||||||||||
We have large stock, so our delivery is very fast.
For example,if products are standarded, the delivery time is one week.
Our company and factory addrss: Ningbo City, Zhejiang Province,China.
Our city has a large port and an airport, so its transportation is very convenient.
Question1: What are the prices of your products?
Answer: For each model, the unit price is listed on the website, but what is displayed on the website is only the average market price. For specific models, you can contact us for further consultation and negotiation.
Question 2: Are you a factory or a trade company?
Answer: We are a factory with top sales for the trade service.
Question 3: What is the minimum order quantity for each order?
Answer: For products of regular models, the minimum order quantity is at least five. We welcome you to test the quality of our products and services through placing trial orders. Looking forward to the long-term cooperation with you.
Question4: What is your company's service tenet?
Answer: Quality first, service upmost. We promises that if there is any problem with the quality of the product, or if the product is damaged during the transportation, our company will be responsible for compensation, regardless of the ordder turnover value.
Question5: Can I try to get a SAMPLE before the order?
Answer: Sure. Our company will provide you with samples for free, but you will have to pay for the international delivery (freight collect payment).
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