Graco 308738C manual System Accessories, Installation

Installation

System Accessories

WARNING

A bleed-type master air valve (D) and a fluid drain valve (L) are required in your system. These accessories help reduce the risk of serious injury including fluid injection, splashing in the eyes or on the skin, and injury from moving parts if you are adjusting or repairing the pump.

The bleed-type master air valve relieves air trapped between this valve and the pump after the air is shut off. Trapped air can cause the pump to cycle unexpectedly. Locate the valve close to the pump. Order Part No. 113333.

The fluid drain valve assists in relieving fluid pres- sure in the displacement pump, hose, and gun. Triggering the gun to relieve pressure may not be sufficient. Order one of the following:

Part No. Description

238635 1/4 npt (mbe), carbon steel

210657 1/4 npt (mbe), carbon steel

210658 3/8 npt (mbe), carbon steel

210659 1/4 npt x 3/8 npt (mbe), carbon steel

239018 1/4 npt (mbe), stainless steel

235992 1/4 npt x 3/8 npt (mbe), stainless steel

Air and Fluid Hoses

Be sure all air and fluid hoses are properly sized and pressure-rated for your system. Use only electrically conductive air and fluid hoses. Use a 13 mm (1/2 in.) I.D. (minimum) air hose (H) to supply air to the pump.

Fluid hoses must have spring guards on both ends. Connect a fluid hose (M) to the pump’s 3/4 npt(f) fluid outlet. Use of a short whip hose between the main fluid hose and the gun allows freer gun movement.

Air Line Accessories

Install the following accessories in the order shown in Fig. 2, using adapters as necessary:

DAir line lubricator (C)

Provides automatic air motor lubrication.

DBleed-type master air valve (D)

Required in your system to relieve air trapped between it and the air motor when the valve is closed (see the WARNING at left). Be sure the bleed valve is easily accessible from the pump, and is located downstream from the air regulator (E).

DAir regulator (E)

Controls pump speed and outlet pressure by adjusting the air pressure to the pump. Locate the regulator close to the pump, but upstream from the bleed-type master air valve (D).

DPump runaway valve (K)

Senses if the pump is running too fast and shuts off the air supply to the motor. A pump which runs too fast can be seriously damaged.

DAir line filter (F)

Install an air line filter (F) and a moisture trap and drain valve (J) to help remove moisture and contaminants from the compressed air supply.

DSecond bleed-type air valve (G)

Isolates the air line accessories for servicing. Locate upstream from all other air line accessories.

Fluid Line Accessories

Install the following accessories in the positions shown in Fig. 2, using adapters as necessary:

DFluid drain valve (L)

Required in your system to relieve fluid pressure in the hose and gun (see the WARNING at left). Install the drain valve so that it points down and the handle points up when it is opened.

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