Hydril Drop-in Check Valves

Redefining Your Valve Reliability

The Checkguard is an essential drilling tool from Hydril Pressure Control that prevents return flow during a kick. It can be used in most drilling situations where return flow through the drill string is a risk and the benefits of a full-bore sub are needed during normal operation. It also can be installed only as needed: It does not affect measurement-while-drilling tools and permits retrieval of other through-string tools. Checkguard valve installation significantly improves and simplifies well control because of its innovative design, which includes:

  • Hardened flow passages for resistance to erosion.
  • Wireline retrievability, which eliminates the need to trip the drill string.
  • Positive closure. After traveling down the drill string, the check valve lands on the landing sub sleeve and latches positively into place.
  • Working pressure of 15,000 psi to match the highest pressure BOP equipment.

Selected Engineering Data*

15,000 psi NACE TRIM CHECKGUARD
ASSEMBLY CHECK VALVE LANDING SUB
NO. L-Sub
End
Conn.		 O.D.
in.		 Bore
in.		 WT
lbs.		 O.D.
in.		 Bore
in.		 Len
in.		 WT
lbs.
#27 NC 31 (2 7/8 IF) 1 11/16 5/8 5 4 1/8 1 5/8 36 105
NC 38 (3 1/2 IF)       4 3/4      
WT 38       5 1/8      
XT 39       5      
#35 NC 38 (3 1/2 IF) 2 3/16 7/8 13 4 3/4 2 1/8 36 120
4 1/2 FH       6      
NC 46 (IF)       6 1/4      
NC 50 (4 1/2 IF)       6 3/8      
4 1/2 RRH       5 3/4      
4 1/2 RRHBXB       5 3/4      
3 1/2 EUE       5      
4 1/2 NVAM       5      
WT40       5 1/2      
WT40 box x XT39 pin       5 3/8      
WT40 box x HT38 pin       5 1/4      
#43 NC 50 (4 1/2 IF) 2 11/16 1 3/8 18 6 1/8 2 5/8 36 230
NC 50 (4 1/2 IF)       6 1/4      
NC 50 (4 1/2 IF)       6 3/8      
NC 50 (4 1/2 IF)       6 1/2      
5 1/2 FH       8      
NC 50 (4 1/2 IF)       6 5/8      
#48 NC 50 (4 1/2 IF) 3 1 11/16 23 6 3/8 2 15/16 36 220
5 1/2 FH       7      
6 5/8 RRH       7 3/4      
6 5/8 RRH BXB       7 3/4      
6 5/8 FH       8      
6 5/8 RRH       8      
NC 50 (4 1/2 IF)       6 5/8      
6 5/8 FH       8 1/4      
6 5/8 FH       8 1/2      
WT 56       7 3/4      
XT57       8      
WT50 box X HT55 pin       7 1/8      
XT57       7 3/8      
XT57 box X HT55 pin       7      

*See brochure for additional data

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