| Customization: | Available |
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| Structure: | Single End |
| Pressure: | High Pressure Mechanical Seals |
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(1) Features
• Dual seal
• Cartridge
• Balanced
• Independent of direction of rotation
• Double pressure balanced
• Integrated pumping device
• Variants available: for eccentric screw pumps (-Vario) and
gas-lubricated version (-GSDN)
(2) Advantaages
• Ideal seal for standardizations
• Universal applicable for packings conversions, retrofits or OEM
• No dimensional modification of the seal chamber
(centrifugal pumps) necessary, small radial installation height
• No damage of the shaft by dynamically loaded O-Ring
• Extended service life
• Installation faults are avoided, cost-effective
• No damage caused by dirt entered during assembly
• Straightforward and easy installation due to pre-assembled unit (reduced down-times)
• Individual adaptation to pump design possible
• Customer specific versions available
(3) Operating range (see note on page 1)
Shaft diameter: d1 = 25 ... 100 mm (1.000"…4.000")
Other sizes on request
Temperature: t = -40 °C ... +220 °C (-40 °F…+428 °F)
(Check O-Ring resistance)
Sliding face material combination BQ1
Pressure: p1 = 25 bar (363 PSI)
Sliding velocity: vg = 16 m/s (52 ft/s)
Sliding face material combination Q1Q1 or U2Q1
Pressure: p1 = 20 bar (290 PSI)
Sliding velocity: vg = 10 m/s (33 ft/s)
Barrier fluid circulation system:
p3max = 25 bar (363 PSI)
p3max = 7 bar (102 PSI) for barrier media with poor
lubricating properties
Δp (p3 - p1 )ideal = 2 ... 3 bar (29 ... 44 PSI)
Pump startup:
Δp (p3 - p1)max = 25 bar (363 PSI) allowed
Recommended supply medium: max. ISO VG 5
Axial movement: ±1.0 mm, d1 ≥ 75 mm ±1.5 mm
(4) Item Description
1 Seal face
2, 5, 7, 10, 13, 15 O-Ring
3 Spring
4 Seat
6 Shaft sleeve
8 Cover
9 Seal face
11 Spring
12 Seat
14 Drive collar
16 Set screw
17 Snap ring
18 Assembly fixture (remove after installation)
19 Hex socket head screw
20 Gasket
21 Screw plug
22 Gasket
(5)Materials
Seal face: Silicon carbide (Q1), Carbon graphite resin
impregnated (B), Tungsten carbide (U2)
Seat: Silicon carbide (Q1)
Secondary seals: FKM (V), EPDM (E), FFKM (K),
Perfluorocarbon rubber/PTFE (U1)
Springs: Hastelloy® (M)
Metal parts: CrNiMo steel (G), CrNiMo cast steel (G)
(6) Recommended seal supply
The EagleBurgman QFT1000 buffer system and QFT2000
vessels are suitable for ®-DN in back-to-back
arrangement. The EagleBergmann TS101fb and TS2000
thermosiphon systems support double and back-to-back
seal configurations.
(7)Recommended applications
• Water and waste water technology
• Chemical industry
• Petrochemical industry
• Pharmaceutical industry
• Food and beverage industry
• Centrifugal pumps
• Eccentric screw pumps
• Universally applicable
Dimensions in mm
| Dimensions in mm | ||||||||||
| d1 | d2 | d3min. | d3max. | L4 | L5 | L6 | L7 | a2 | da | s |
| 25 | 43.0 | 44.0 | 51.5 | 25.4 | 86.5 | 53.4 | 33.1 | 62.0 | 105.0 | 13.2 |
| 28 | 46.0 | 47.0 | 52.0 | 25.4 | 86.5 | 53.4 | 33.1 | 61.0 | 105.0 | 13.2 |
| 30 | 48.0 | 49.0 | 56.0 | 25.4 | 86.5 | 53.4 | 33.1 | 67.0 | 105.0 | 13.2 |
| 32 | 49.8 | 51.0 | 57.0 | 25.4 | 86.5 | 53.4 | 33.1 | 70.0 | 110.0 | 13.2 |
| 33 | 49.8 | 51.0 | 57.0 | 25.4 | 86.5 | 53.4 | 33.1 | 70.0 | 110.0 | 13.2 |
| 35 | 53.0 | 54.0 | 61.5 | 25.4 | 86.5 | 53.4 | 33.1 | 72.0 | 113.0 | 13.2 |
| 38 | 56.0 | 57.0 | 66.0 | 25.4 | 86.5 | 53.4 | 33.1 | 75.0 | 123.0 | 13.2 |
| 40 | 58.0 | 59.0 | 68.0 | 25.4 | 86.5 | 53.4 | 33.1 | 77.0 | 123.0 | 14.2 |
| 42 | 60.5 | 61.5 | 69.5 | 25.4 | 86.5 | 53.4 | 33.1 | 80.0 | 133.0 | 14.2 |
| 43 | 60.5 | 61.5 | 70.5 | 25.4 | 86.5 | 53.4 | 33.1 | 80.0 | 133.0 | 14.2 |
| 45 | 62.5 | 64.0 | 73.0 | 25.4 | 86.5 | 53.4 | 33.1 | 82.0 | 138.0 | 14.2 |
| 48 | 65.6 | 67.0 | 75.0 | 25.4 | 86.5 | 53.4 | 33.1 | 85.0 | 138.0 | 14.2 |
| 50 | 68.0 | 69.0 | 78.0 | 25.4 | 86.5 | 53.4 | 33.1 | 87.0 | 148.0 | 14.2 |
| 53 | 72.0 | 73.0 | 87.0 | 25.4 | 86.5 | 53.4 | 33.1 | 97.0 | 148.0 | 18.0 |
| 55 | 73.0 | 74.0 | 83.0 | 25.4 | 86.5 | 53.4 | 33.1 | 92.0 | 148.0 | 18.0 |
| 60 | 78.0 | 79.0 | 91.0 | 25.4 | 86.5 | 53.4 | 33.1 | 102.0 | 157.0 | 18.0 |
| 65 | 84.8 | 85.7 | 98.5 | 25.4 | 86.5 | 53.4 | 33.1 | 109.0 | 163.0 | 18.0 |
| 70 | 93.0 | 95.0 | 108.0 | 25.4 | 86.5 | 53.4 | 33.1 | 118.0 | 178.0 | 18.0 |
| 75 | 100.0 | 101.6 | 118.0 | 28.0 | 108.0 | 63.9 | 44.1 | 129.0 | 190.0 | 18.0 |
| 80 | 106.4 | 108.0 | 124.0 | 28.0 | 108.0 | 63.9 | 44.1 | 135.0 | 195.0 | 18.0 |
| 85 | 109.5 | 111.1 | 128.0 | 28.0 | 108.0 | 63.9 | 44.1 | 139.0 | 198.0 | 22.0 |
| 90 | 115.9 | 117.5 | 135.0 | 28.0 | 108.0 | 63.9 | 44.1 | 145.0 | 205.0 | 22.0 |
| 95 | 119.1 | 120.7 | 138.0 | 28.0 | 108.0 | 63.9 | 44.1 | 148.0 | 208.0 | 22.0 |
| 100 | 125.4 | 127.0 | 144.0 | 28.0 | 108.0 | 63.9 | 44.1 | 154.0 | 218.0 | 22.0 |
| Dimensions in inch | ||||||||||
| d1 | d2 | d3min. | d3max. | L4 | L5 | L6 | L7 | a2 | da | s |
| 1.000 | 1.693 | 1.732 | 2.008 | 1.000 | 3.400 | 2.102 | 1.303 | 2.440 | 4.134 | 0.520 |
| 1.125 | 1.811 | 1.875 | 2.050 | 1.000 | 3.400 | 2.102 | 1.303 | 2.402 | 4.134 | 0.520 |
| 1.250 | 1.961 | 2.008 | 2.244 | 1.000 | 3.400 | 2.102 | 1.303 | 2.760 | 4.330 | 0.520 |
| 1.375 | 2.087 | 2.126 | 2.421 | 1.000 | 3.400 | 2.102 | 1.303 | 2.840 | 4.449 | 0.520 |
| 1.500 | 2.205 | 2.244 | 2.598 | 1.000 | 3.400 | 2.102 | 1.303 | 2.950 | 4.843 | 0.520 |
| 1.625 | 2.343 | 2.375 | 2.700 | 1.000 | 3.400 | 2.102 | 1.303 | 3.090 | 4.842 | 0.559 |
| 1.750 | 2.461 | 2.520 | 2.874 | 1.000 | 3.400 | 2.102 | 1.303 | 3.230 | 5.433 | 0.559 |
| 1.875 | 2.582 | 2.638 | 2.953 | 1.000 | 3.400 | 2.102 | 1.303 | 3.350 | 5.433 | 0.559 |
| 2.000 | 2.677 | 2.717 | 3.071 | 1.000 | 3.400 | 2.102 | 1.303 | 3.430 | 5.827 | 0.559 |
| 2.125 | 2.835 | 2.874 | 3.425 | 1.000 | 3.400 | 2.102 | 1.303 | 3.819 | 5.827 | 0.709 |
| 2.250 | 2.961 | 3.000 | 3.560 | 1.000 | 3.400 | 2.102 | 1.303 | 3.940 | 6.181 | 0.709 |
| 2.375 | 3.071 | 3.125 | 3.583 | 1.000 | 3.400 | 2.102 | 1.303 | 4.020 | 6.181 | 0.709 |
| 2.500 | 3.213 | 3.300 | 3.800 | 1.000 | 3.400 | 2.102 | 1.303 | 4.180 | 6.417 | 0.709 |
| 2.625 | 3.339 | 3.374 | 3.937 | 1.000 | 3.400 | 2.102 | 1.303 | 4.303 | 6.417 | 0.709 |
| 2.750 | 3.661 | 3.740 | 4.252 | 1.000 | 3.400 | 2.102 | 1.303 | 4.660 | 7.008 | 0.709 |
| 2.875 | 3.937 | 4.000 | 4.646 | 1.000 | 4.250 | 2.516 | 1.736 | 5.079 | 7.480 | 0.709 |
| 3.000 | 3.937 | 4.000 | 4.646 | 1.102 | 4.250 | 2.516 | 1.736 | 5.079 | 7.480 | 0.709 |
| 3.125 | 4.189 | 4.252 | 4.882 | 1.102 | 4.250 | 2.516 | 1.736 | 5.315 | 7.677 | 0.709 |
| 3.250 | 4.189 | 4.252 | 4.882 | 1.102 | 4.250 | 2.516 | 1.736 | 5.315 | 7.677 | 0.709 |
| 3.375 | 4.311 | 4.375 | 5.039 | 1.102 | 4.250 | 2.516 | 1.736 | 5.472 | 7.795 | 0.866 |
| 3.500 | 4.437 | 4.500 | 5.157 | 1.102 | 4.250 | 2.516 | 1.736 | 5.591 | 7.795 | 0.866 |
| 3.625 | 4.563 | 4.625 | 5.315 | 1.102 | 4.250 | 2.516 | 1.736 | 5.709 | 8.071 | 0.866 |
| 3.750 | 4.689 | 4.752 | 5.433 | 1.102 | 4.250 | 2.516 | 1.736 | 5.827 | 8.189 | 0.866 |
| 4.000 | 4.937 | 5.000 | 5.669 | 1.102 | 4.250 | 2.516 | 1.736 | 6.063 | 8.583 | 0.866 |
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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