Building Code Of The Day 10/21/2018

(A) backwater or swing check valve, and gate

valve

(B) backwater valve or double check valve, and

globe valve

(C) backwater valve, spring-loaded check valve,

and union

(D) backwater valve, gate valve, and flange

Answer:  A Sec. 710.4

710.4 Discharge line.

The discharge line from such ejector, pump, or other mechanical device shall be provided

with an accessible backwater or swing check valve and gate or ball valve. Where the gravity drainage line to which such discharge line connects is horizontal, the method of connection

shall be from the top through a wye branch fitting. The gate or ball valve shall be located on the discharge side of the backwater or check valve.

Gate or ball valves, where installed in drainage piping, shall be fullway type with working parts of corrosion-resistant metal. Sizes 4 inches (100 mm) or more in diameter shall have cast-iron bodies, and sizes less than 4 inches (100 mm), cast-iron or brass bodies.