Non-Porous Diffusers

2.5.3

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NOTE: Delete inapplicable types of diffusers and

materials of construction.

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2.5.3.1

Nozzle-Type Diffusers

Diffusers shall be nozzle type and shall be one of the following:

a.

Diffuser consisting of a molded plastic body with four high

velocity, short tube orifices, each discharging at right angles to

the adjacent orifice. [The diffuser shall have a deflector ring

above the discharge orifices and shall contain a control orifice

to ensure proper headloss.]

b.

Diffuser of molded plastic and consisting of a top piece

containing inverted V-shaped air shear slots and an upward sloping

air deflector and a bottom piece containing a control orifice and

an air header connector.

2.5.3.2

Orifice-Type Diffusers

Diffusers shall be nonvalved orifice type and shall be one of the following:

a.

Diffuser constructed of stainless steel and consisting of a

balancing nozzle, an inverted air reservoir, air exit ports

located on horizontal planes on two levels, and a deflector. The

deflector shall direct the liquid along the diffuser's outer walls.

b.

Diffuser consisting of an open bottom, molded plastic, rectangular

box containing tapered air release holes. Air entering the

diffuser shall be controlled by a control orifice.

c.

Diffuser consisting of an elongated, peaked dome air chamber with

steep inverted V-shaped serrations on both sides. Air exiting the

header shall be controlled by an orifice.

2.5.3.3

Valved Orifice Diffusers

Diffusers shall be of the valved orifice type and shall be one of the

following:

a.

Diffuser consisting of a molded plastic body with an air flow

control orifice and a PVC disc cap retained by a stainless steel

ring.

b.

Diffuser consisting of a stainless steel body containing a control

orifice, a polytetrafluroethylene ball, and a stainless steel

deflector disc.

c.

Diffuser consisting of a molded plastic body with air release

orifices, a ball check valve, and a screw-in cap that allows

varying the quantity of orifices through which air can exit.

d.

Diffuser consisting of a cone-shaped plastic base with a flexible

elastomer cover held in place by a center bolt.

SECTION 11375A

Page 28