Mechanical Seals
Mechanical Seals for Pumps · Pusher Seals

LEK777Features
API 682 Category 2 and 3, Type A,Arrangement 1 seal
Single seal
Balanced
Cartridge unit
Stationary multiple springs
Solid seal faces

Advantages
Suitable for higher speeds
Good followability due to no influence fromrun-out, squareness or vibration of the shaft
Compact design
Low heat generation and power consumption
due to narrow seal face widthLonger seal life
Pressure-balanced design prevents mating
ring being forced out under reverse pressure
No damage to shaft sleeve as dynamic
O-Ring is not in direct contact with the sleeve

ItemDescription
1
Seal ring
2, 5, 7, 10 O-Ring
3
Spring4
Mating ring
6
Seal sleeve
8
Drive screw
9
Gland plate11
Flow distributor
12
Retaining ring
13
Throttle bushing
14
Drive collar
15, 16
Set screw17
Setting device
18
HSH Cap screw

05.02.2013 (c) EagleBurgmann

EagleBurgmann Japan Co., Ltd.
1-12-15, Shiba-Daimon, Minato-Ku
Tokyo, 105-8587
Japan

Tel.: +81 (0)33432 4771
Fax: +81 (0)33438 2370
info@jp.eagleburgmann.com
www.eagleburgmann.jp

All technical specifications are based on extensive tests and our many years ofexperience. The diversity of possible applications means, however, that they can serve
only as guide values. We must be notified of the exact conditions of application
before we can provide any guarantee for a specific case. Subject to change.

LEK777 (2)Recommended applications
Refining technology
Oil and gas industry
Petrochemical industry
Chemical industry
Power plant technology
Light volatile hydrocarbons

LPG plants
API 610 / ISO 13709 pumps
Process pumps

Operating range
Pressure (product seal): p = vacuum ... 60 bar ( … 870 PSI)
Temperature: -40 °C … +176 °C (-40 °F … +349 °F)*
Sliding velocity: vg = 50 m/s (164 ft/s)
Viscosity: ... 300 mPa·s
Solids content: ... 0.5 wt.%
* Engineered up to 260 °C (500 °F) with FFKM (K) secondary seals

Standards and approvals
API 682 / ISO 21049

Materials
Seal ring: Blister resistant carbon,
Silicon carbide SSiC (Q1), RBSiC (Q2)
Mating ring:
Silicon carbide SSiC (Q1), RBSiC (Q2)
Secondary seals:
FKM (V), FFKM (K), EPDM (E), NBR (P)Springs: Hastelloy® C-276 (M5)
Metal parts: CrNiMo steel 316 (G)Recommended piping plans
Process side:
01, 02, 11, 12, 13, 14, 21, 22, 23, 31, 32, 41
Atmospheric side:
51, 61, 62, 65A, 65B, 66A, 66B

Dimensions
API/d1

API/d2

API/d3

d4

d5

l1

l2

l3

l4

20

70

105

51

128

100

70

30

50

30

80

115

63

138

102

70

32

50

40

90

125

74

148

105

70

35

50

50

100

140

84

168

105

70

35

50

60

120

160

99

188

107

72

35

52

70

130

170

108

198

107

72

35

52

80

140

180

120

208

107

72

35

52

90

160

205

138

238

114

79

35

59

100

170

215

148

248

115

80

35

60

110

180

225

157

258

120

80

4060

Dimensions in millimeter05.02.2013 (c) EagleBurgmann

EagleBurgmann Japan Co., Ltd.
1-12-15, Shiba-Daimon, Minato-Ku
Tokyo, 105-8587
Japan

Tel.: +81 (0)33432 4771
Fax: +81 (0)33438 2370
info@jp.eagleburgmann.com
www.eagleburgmann.jp

All technical specifications are based on extensive tests and our many years ofexperience. The diversity of possible applications means, however, that they can serve
only as guide values. We must be notified of the exact conditions of application
before we can provide any guarantee for a specific case. Subject to change.