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VTX Dual Seals

Mechanical Seals for Eccentric Screw Pumps

Product Description

  • Additional variants available for ANSI pumps
  • Balanced
  • Cartridge
  • Independent of direction of rotation
  • Dual Seal


Item No. Description
1 Seal face
2,5,7,10,13,15 O-Ring
1.2 Bellows
3 Spring
4,12 Seat
6 Shaft sleeve
8 Cover
9 Seal Face
11 Spring
14 Driver
16 Set screw
17 Retaining Ring
18 Assembly Fixture
19 Hsh Cap Screw

Technical Features

  • Cost-effective
  • Easy installation due to pre-assembled unit (reduced down-times)
  • Ideal seal for standardizations
  • No damage caused by dirt entered during assembly
  • No damage of the shaft by dynamically loaded O-Ring
  • Universal applicable for packings conversions, retrofits or original equipment


CTX seals with modified cover for eccentric screw pumps. Example Pumps: Seepex BN, Netzsch NM...S, NM...B, NE (P), Allweiler AE, AEB, AED, Robbins & Myers / Moyno 2000 CC, and Mono E-Range.

Typical Industrial Applications

  • Foodstuffs and animal feed industries
  • Sweet cider pressing and beverage production
  • Viticulture and wineries
  • Spirit production and alcohol industry
  • Breweries and malt houses
  • Sugar industry
  • Pharmaceuticals and cosmetics industry
  • Oil and gas industry
  • Pulp and paper production
  • Paint and lacquer industry
  • Chemicals industry
  • Automobile industry
  • Water and wastewater industry




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), Perflourocarbon rubber/PTFE
(U1) Springs: Hastelloy® C-4 (M)
Metal parts: CrNiMo steel (G), CrNiMo cast steel (G)

Performance Capabilities

Sizes: Upto 140mm (Upto 5.500")
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)
Speed = 16 m/s (52 ft/s)
Sliding face material combination Q1Q1 or U2Q1
Pressure: p1 = 12 bar (175 PSI)
Speed = 10 m/s (33 ft/s)
Permissible axial movement: ± 1.0 mm, d1 75 mm
± 1.5 mm

CTX ANSI Single Seals
Standard Cartridge Seals
Mechanical Seals As Per API 682
Split Seals
Engineered Seals For Demanding Applications
Standard Mechanical Seals For Pumps & Compressors
Mechanical Seals For Agitators, Mixers, Kneaders & Reactors
Supply Systems & Components
Gas Lubricated Seals for Pumps & Agitators
API 682 / ISO 21049
Technical Information