Hydraulic Products, X64 Range - ISO 16028 Flat-Face Pressure Eliminator Nipples

Series 664, DN16 Pressure Eliminator

  • Flat-Face design
  • Connection under pressure
  • One-hand operated

CEJN Series 664 is a Flat-Face quick-connect nipple with a built-in pressure eliminator. The nipple is according to and exceeds the demands in the ISO 16028 Standard for low- and medium-pressure hydraulic applications. The Flat-Face design minimizes spillage during connection and disconnection. The pressure eliminator allows for connection with residual/trapped pressure on the nipple side. The nipple Series 664 connects with couplings in Series 665.


The pressure eliminator nipples are also available in four other sizes; DN 6.3 (Series 264), DN 10 (Series 364), DN 12.5 (Series 564), DN 19 (Series 764). For steel couplings in accordance with ISO 16028 see Series 665.

Series 664, DN16 Pressure Eliminator
Technical data
Temperature range: -30°C — +100°C (-22°F — +212°F)
Material nipple: Hardened steel (zinc passivation)
Material seal: Nitrile (NBR/PUR)
Connectability: With static pressure up to 400 bar on the nipple side
Max. working pressure connected: 400 bar (5801 PSI)
Max. working pressure disconnected: 400 bar (5801 PSI)
Min. burst pressure connected: 1200 bar (17404 PSI)
Min. burst pressure disconnected: 1200 bar (17404 PSI)
Disconnection under pressure: Not allowed
Comment: Connects with couplings from Series 665
Interchangeable with: All brands dimensionally interchanging with ISO16028

Rated flow is measured at 0.1 MPa pressure drop.
Approved to max working pressure
Max working pressure 25 MPa according to ISO 16028

Pressure drop chart
Series 664, DN16 Pressure Eliminator
Flow measured with coupling Series 665
Nipples with pressure eliminator Part No. Connection Length Diameter Hexagon Seal
Female thread 10 664 6201106646201G 3/4" (BSP)99.54036NBR
 10 664 64011066464013/4" NPT99.54036NBR
 10 664 6101106646101Rc 3/4" (BSPT)99.54036NBR
 10 664 66001066466007/8"-14 UNF (5/8" SAE)99.54036NBR
 10 664 66011066466011 1/16"-12 UN (3/4" SAE)99.54136NBR
Male thread 10 664 67521066467521"-14 ORFS bulkhead129.540.536NBR
 10 664 6551106646551M26x1.5 18L100.54036NBR


Check with an authorized CEJN distributor for availability and prices. Other connections and sealing material on request. Some part numbers may be subject to minimum order quantities. CEJN reserves the right to make changes without further notification. Thread connections are listed according to ISO Standards. All measurements are in mm.

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