Well Control Valves (DSSV, FOSV & IBOP) for Drilling and Workover Operations

All three are well control safety valves designed to stop uncontrolled flow through the drill string, but they differ in design and application. A Drill String Safety Valve (DSSV) is a full-bore valve that can be stabbed into the drill string at the rig floor during a kick situation. A Full Opening Safety Valve (FOSV) has a larger internal bore that allows wireline tools and other equipment to pass through while maintaining well control capability. An Inside Blowout Preventer (IBOP) is a poppet-style valve that automatically closes when internal pressure drops, making it particularly suited for top drive installations. M&M Oil Tools manufactures all three configurations with the same PWC Cartridge™ technology and NACE-compliant materials as standard.

The PWC Cartridge™ is M&M Oil Tools' patent-pending drop-in valve assembly that replaces the internal components of a conventional well control valve as a single pretested unit. Unlike standard valve construction that requires disassembly and individual component replacement in the field, the PWC Cartridge drops in without special tools — reducing service time and the risk of improper reassembly. The cartridge design also equalizes pressure across the ball and loads it against the downstream seal, preventing pressure trapping and reducing the torque required to open the valve by up to 50% compared to competing designs.

Yes. M&M Oil Tools Well Control Valves are designed and tested for High Pressure / High Temperature (HPHT) service, making them suitable for deepwater, unconventional, and extended-reach well environments where downhole conditions exceed standard operating parameters. Each valve features a dual soft and hard seat sealing design that maintains integrity under both low- and high-pressure conditions. Every order ships with mill certificates, test reports, and a Certificate of Conformance.

Yes. Every M&M well control valve — across all three configurations — is manufactured using NACE MR0175/ISO 15156-qualified materials as standard. This means a single valve serves both standard and sour service applications without requiring a separate order or configuration. Operators running mixed programs offshore or onshore where hydrogen sulfide may be present do not need to maintain separate valve inventories for sour versus standard service.

Every M&M well control valve ships with full material traceability documentation including mill certificates, test reports, and a Certificate of Conformance issued under M&M's API Q-1 quality system. This documentation package satisfies operator, regulatory, and third-party auditor requirements for well control equipment on domestic and international projects.