Sealweld Flow Wolf Inner-Check Valve
$45.93
Bulk Orders
What is the Sealweld Flow Wolf Inner-Check Valve?
A Flow Wolf inner-check valve is an internal check valve for the valve’s sealant injection system: Sealweld’s patented threaded cage stops the ball check from being accidentally injected into the valve when heavy sealant is pumped.
According to Sealweld, the patented Flow Wolf design was invented in the field by Sealweld founder W.J. ‘Bill’ Chisholm after conventional manufacturers’ sealant fittings plugged off and blew out their check mechanisms while injecting super-heavy sealant into severely leaking valves. Sealweld states that many of the world’s largest pipeline operators prefer Flow Wolf fittings, and tells buyers to specify ‘Sealweld Flow Wolf sealant fittings – no substitutes’ on new valve orders.
PE Energy supplies the genuine Sealweld Flow Wolf Inner-Check Valve across the USA — request a quote for any part number below.
Where is the Flow Wolf Inner-Check Valve used?
Sealant injection into pipeline ball, gate and plug valves under pressure. Sealweld’s material notes that internal check valves are specified when new valves are commissioned, so the valves can be serviced under pressure safely.
Specifications (Sealweld, Flow Wolf internal check valves)
| Construction | Stainless steel (Sealweld also lists a 1/2″ Inconel 625 undersized DUO version, part 420489); the patented Flow Wolf threaded cage prevents the ball check from being accidentally injected into the valve when pumping heavy sealant. |
|---|---|
| Registration | ABSA Certificate of Authorization, Canadian Registration Number CRN 0C07140.2 |
| Threads | 1/4″-18, 3/8″-18, 1/2″-14 NPT |
Which Sealweld part numbers are available?
| Part Number | Packaging / Variant |
|---|---|
| 420492 | Flow Wolf Inner-Check Valve – 1/4″ – Stainless Steel – DUO |
| 420496 | Flow Wolf Inner-Check Valve – 3/8″ – Stainless Steel – DUO |
| 420488 | Flow Wolf Inner-Check Valve – 1/2″ – Stainless Steel – Undersize |
| 422877 | Flow Wolf Inner-Check Valve – 1/2″ – Stainless Steel – DUO |
| 420161 | Flow Wolf Inner-Check Valve – 3/8″ – Stainless Steel |
| 420159 | Flow Wolf Inner-Check Valve – 1/4″ – Stainless Steel |
| 420487 | Flow Wolf Inner-Check Valve – 1/2″ – Stainless Steel |
Every part number is available for quotation — contact PE Energy with the Sealweld part number and quantity.
Additional information
| Weight | N/A |
|---|---|
| Size | 1/4", 3/8", 1/2" – Stainless Steel – Undersize, 1/2" – Stainless Steel – DUO, 3/8" – Stainless Steel, 1/4" – Stainless Steel, 1/2" – Stainless Steel |



















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