A modular fluid control system comprised of a plurality of fluid control modules (11), each including a manifold portion (17), and a support element (14) to which the modules are mechanically fixed (12). The manifolds of adjacent units are pneumatically, but not mechanically, connected in order to communicate therebetween. In such an arrangement the modules can be removed from within an array without disturbing neighboring units.

A control unit for controlling machine functions of a mining machine, such as an underground mining machine, tunneling machine or bolting rig, includes a flameproof housing having at least one fluid inlet and at least one fluid outlet, and a plurality of fluid control valves respectively communicating with the at least one inlet and outlet. In particular, the fluid control valves are formed inside at least one valve monoblock, the monoblock including a plurality of distinct fluid passages.

The invention relates to a connecting apparatus, provided for fluid-conducting connection to at least one main component (10), which component has a plurality of mutually adjacent fluid passage points (P1, P2, P3, Pn . . . Px), said connecting apparatus having a main body (12), which serves to control a fluid flow by means of at least one functional component (14), such as a valve device; a plurality of further fluid passage points (P1, P2, P3, Pn . . . Px), which can be connected to each other in a fluid-conducting manner via the functional component (14) with assignable fluid passage points in the main component (10); and at least one shut-off part, which shuts off the respective fluid passage point (P2, P3, Pn . . . Px1 in the main component (10) and/or in the main body, said fluid passage point remaining unaffected by the functional component (14). Said connecting apparatus is characterised in that there is in each case a fluid-conducting connection line (30, 32) inside the main body (12) between the further fluid passage points (P1, P2, P3, Pn . . . Px) and the functional component (14), which fluid-conducting connection line can be shut off by a separate shut-off part, as long as the associated connection to the functional component (14) remains unused.

Embodiments of a manifold of a hydraulic fracturing system include a junction having an inlet flow bore. The junction can include an integrated flow junction and valve check assembly having a body including a central portion and one or more side portions. The central portion can be positioned between a pair of manifold sections of the manifold and attached thereto. The one or more side portions extend radially from the central portion and include an inlet bore through which a pressurized fluid is received and supplied to the manifold. One or more check valves is positioned along the inlet bore so as to be integrated within the body of the junction.