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The

∆∆∆∆ P

is less than (Inlet - Set Pressure) therefore; The 1" regulator will meet the system requirements. To determine the maximum flow through the regulator for this example, calculate the following:

PRESSURE DROP

∆∆∆∆ P = [Q / Cv]

2 ∆ P ⇒ Pressure drop across regulator in PSI Q ⇒ Flow Rate in GPM C
V ⇒ Flow Coefficient from chart

Q = Cv

Pressure Regulators - 16511 √√√√

∆∆∆∆ P Q = 5.5

√√√√

20

or

Q = Cv

√√√√

inlet pressure - set pressure

Q = 24.6 GPM

INSTALLATION The pressure regulator should be installed in an upright position. It is recommended that downstream pressure surges be avoided, as the regulator reacts to downstream pressure variations. Surges are caused by rapid shutdown of downstream flow. A shut - off valve should be installed upstream of the regulator. It is also recommended that a HAYWARD Y-Strainer or Basket Strainer be installed upstream of the regulator to maintain a flow of clean fluid through the regulator, which will prolong the life of the internal seals and diaphragm. The pipe plug installed at the bottom of the body, may be removed before pressurizing the system and a 1/4" male N.P.T. pressure gauge installed in it's place. This will serve as a system check of the downstream or "set" pressure of the regulator. Should the chemical compatibility of the process fluid not be consistent with the materials of the internal components of the gauge, (typically brass) a HAYWARD GAUGE GUARD should be installed to protect the gauge. OPERATION The HAYWARD pressure regulator automatically controls downstream line pressure and compensates for variations in inlet pressure. Should a pressure increase occur that would cause excessive downstream flow through the system, the regulator will close down, thus lowering the flow rate and pressure. Conversely, if the flow is reduced due to a drop in the system pressure, the regulator will open wider to allow increased flow. It will open and close continuously, maintaining the desired downstream pressure in the system. ADJUSTMENT To adjust the pressure regulator, loosen the locknut (see figure below), and turn the adjustment screw counterclockwise to decrease downstream regulated pressure, and clockwise to increase downstream regulated pressure. When the desired pressure is achieved, tighten the locknut. APPLICATION The pressure regulator should typically be used for controlling downstream line pressures up to 75 PSIG. PRESSURE RATING: 150 PSI NON-SHOCK @ 70 °°°° F

PRESSURE REGULATOR PARTS LIST 1. SPRING 2. ROLLING DIAPHRAGM (Viton)® 3. O-RING SEALS (Viton)® 4. PIPE PLUG [GAUGE PORT] 5. SQUARE CUT SEAL (Viton)® 6. BODY 7. BONNET 8. ADJUSTMENT SCREW 9. LOCKNUT

Dimensions in inches. Weight in Pounds. For reference only Size A B C D Weight

PRIS Rev B 9/3/99 ECR 819R

1/4” 4.13 9.25 2.13 2.38 1.38 1/2” 4.13 9.25 2.13 2.38 1.38 3/4” 4.13 9.25 2.13 2.38 1.38 1” 5.50 14.00 3.00 2.38 4.75 1-1/2” 5.50 14.00 3.00 2.38 4.75