Chapter CLII: Section 89: Valves and Cocks

(_See also p. 198._)

=2527. Slide valve ports,= with gradual cut-off.

=2528. Piston valve= in section. See No. 1654. This construction avoids spring rings, which do not run well across the ports, the entire valve being sprung into the bore.

=2529. Tube air valve.= Can be made to open and shut by revolving, or by longitudinal motion.

=2530. Corliss valve,= with rectangular rocking spindle.

=2531. Flume valve= for water.

=2532. Double cone valve= for steam or water, closes the leakage round the screw when opened, and requires no packing.

=2533. Double ported slide valve.=

=2534. Cone plug and rubber ring= for plugging a pipe.

=2535. Reversing valve= for gas or air blast.

=2536. Slide valve= to give a wide port opening with short travel.

=2537. Removable valve seat,= or gland, secured by three set screws and lugs inside the valve box.

=2538. Safety valve, with double ball joint seatings,= held down by dead weight, hung on the outer case.

=2539. Oscillating ring valve.=

=High-pressure hydraulic slide valves= are now made of hard wood, such
as lignum vitæ, running on a bronze face; the wood valve is sometimes
enclosed in a bronze body or strap.

=2540. Hydraulic high-pressure valve,= with renewable face.

=2541. Tap, with crank movement,= to open and close an ordinary mushroom valve.

=2542. Spring loaded valve.= May be opened by lifting, as shown, or by a horizontal pull in any direction, the pull rod being attached to the top of a fixed stud in the centre of the valve, which then tilts in opening.

=2543. Safety valve, with knife edge.=

=2544. Screw plug bottle stopper.= (Codd’s patent.)

=2545. Dished grating valve.=