The Orbit Fab RAFTI Service Valve (RSV) is a passive Rapidly Attachable Fluid Transfer Interface (RAFTI) that enables cooperative docking in space.

It consists of an octagonal grapple fixture and two valve cores. A single RSV supports the transfer of two independent fluids, for example, propellant and pressurant. The RAFTI Service Valve is designed to support three major functions of the spacecraft on which it is installed:

1. Fill and drain functions for the propulsion system during ground operations
2. A prepared spacecraft docking interface for primary docking attachments, and/or a utility interface for secondary attachments, providing the alignment and preload to the fluid transfer interface
3. Fluid transfer functions during in-space fueling operations

It can be used on any vehicle intended to be refueled or from which fuel could be extracted, including client vehicles, fuel shuttles, and fuel depots.

The RAFTI Service Valve comprises three primary parts and assemblies:

1. Grapple Fixture
2. Passive Valve Cores
3. Cover Closeout Assembly

The Grapple Fixture is used as a docking interface to mate two spacecraft together. It can also be used in conjunction with another docking interface, strictly as a utility interface, to provide alignment and preload to the mating valve cores.

The RSV contains Passive Valve Cores which define the fluid transfer interface. RAFTI uses a pintle valve design, where the pintle in RSV is actuated via the active coupling half within the Orbit Fab GRIP system.

Valve cores come in multiple variations to account for two pressure ratings and material compatibility with various fluids. The Valve Cores use elastomeric o-rings for static sealing and energized seals for dynamic sealing applications.

The Cover Closeout Assembly mechanisms are included on the RAFTI Service Valve and actuated passively during mating when a utility connection is established.