The city has burrowed under parks before, most notably in Central Park, where it has buried four huge valve chambers, the last one about 25 years ago.

Con Cast Pipe expanded its product base to box culverts, large valve chambers and precast concrete arch systems (con/spans) for bridge construction.

Where gridiron valves are used as secondary valves, they were commonly mounted on the inlet side of the valve chamber for the primary slide valve.

To eliminate this "junk," the Irvine physicists plan to install their ten-ton detector inside a valve chamber on the Arizona side of the Colorado River canyon.

Water from these two legs of the tunnel will travel through enormous manifolds into pipes within a 135-by-40-foot valve chamber some 320 feet below the street.

Besides the 750-foot-deep distribution shaft that is to carry water to the mains, site 17B also requires an access shaft, with stairs and elevator, leading down to the valve chamber.

Construction of the shafts and valve chamber is expected to take four and a half years.

Includes everything that the SL94 offers except for the valve chambers.

The locomotive's marker lights, headlight, handrails, coupler lifting rods, cylinder head covers, and back valve chambers were nickel plated.

The largest valve chamber is in Van Cortlandt Park.