Type JCS2 O-ring Pusher Seals | John Crane Mechanical Seals
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Type JCS2

Integrated Double Mechanical Seal for Demanding Conditions

Type JCS2 seals are designed to be used in pumps for environmentally hazardous and abrasive liquids when operating limits for single-acting seals are exceeded. The double-balanced design of the seal allows the use of both pressurized and non-pressurized sealant fluid. This design ensures reliable and long-lasting operation under the most demanding conditions, reducing seal fluid consumption, and prevents environmental emissions.

Several variant of the design available for different services:

JCS2P — OEM (Sulzer Ahlstar Up) Engineered double external stationary spring O-ring mounted seal

JCS2A — Double application-specific seal for Sulzer liquid ring pumps and Andritz ACP pumps

JCS2M — Double application-specific seal for Sulzer multistage pumps

JCS2-MC — Double application-specific seal for Andritz MC-pumps

JCS2E — Double application-specific seal for Sulzer hot liquid pumps


  • California Residents: PROPOSITION 65 WARNING
  • The seal is fully integrated into the pump.
  • No measurements required for installation, reducing risk for error.
  • Shaft misalignment does not pulsate the spring or wear out the O-ring.
  • Torque transmission with super elastic devices, combined with no drive pins at seals faces. This eliminates possible start-up failures.
  • Seal utilizes the integrated and advanced SmartFlow seal water control technology, reducing more than 90% seal water savings usage.


Temperature Limits


Pressure Limits

Process pressure: 350 psi(g)/25 bar(g)

Seal water pressure: 215 psi(g)/15 bar(g)

Speed Limits


Standard Materials

Seal faces: SiC/SiC or SiC/SiC

O-rings: PTFE (product side), EPDM, Viton

Metal parts: EN 1.4436/1.4460 (AISI 316/329)

Springs: EN 1.4436 (AISI 316)

Recommended Applications

  • 流程泵

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