Ball Check Union

Contact Information

RMZ Oilfield Engineering Pte Ltd

02 Tuas Ave 11
Singapore – 638985

+(65) 6265 4972

The RMZ Ball Check Union is an essential equipment in term of overall safety. It is situated directly under the Grease Injection Head (GIH). Its function is to automatically shut off the well if the cable should be pulled off the tool and the cable blown out of the hole.

The Ball Check Union is designed so that the ball is kept away from the cable in normal operations but is unseated and forced up by the velocity of escaping fluid.

The greater the well pressure, the tighter the seal will be. Ball Check Union can be integrated with Tool Catcher to reduce the overall height of the stack assembly.


• Working Pressure rating of 5,000, 10,000 & 15,000 psi available.
• Service: available for both Sour and Standard service.

Technical details for equipment ordering:

• Top & Bottom Connection details.
• Pressuring rating.
• Service.
• Temperature class.
• Product Specification level.

Technical Specification

2.00″-10 AC BOX 4.75″-4AC (3.75) ‘B’ PIN & CLR H2S 5000 990044256
2.00″-10AC BOX 5.00″-4AC (3.50) ‘O’ PIN & CLR H2S 5000 990025394
2.00″-10AC BOX 4.75″-4x2AC (3.75) PIN & CLR H2S 10000 990038736
2.00″-10AC BOX 5.75″-4AC (4.00) ‘O’ PIN & CLR H2S 10000 990005930
2.00″-10AC BOX 6.125″-4x2AC (4.75) PIN & CLR H2S 10000 990036613
2.00″-10AC BOX 7.875″-4x2AC (6.125) PIN & CLR H2S 10000 990044514
2.50″-8AC BOX 7.50″-4AC (5.50) O PIN & CLR H2S 15000 990027607
2.50″-8AC BOX 9.50″-4AC (6.25) ‘O’ PIN & CLR H2S 15000 990044906

1.  All surface pressure control equipment is manufactured and certified to API6A, SI1996/913 and NACE MR-01-75 (for H2S rated equipment). This equipment comes with full certification / Documentation, Operational / maintenance Procedure, Aluminium thread protectors and is painted to client colour specification.
2. The information in the table is given as a guide only, as the information may change depending on the Quick Unions used.