Feature

●Security Protection: Bonnet and poppet repair kits help prevent reverse siphoning of toxic and non-toxic fluids. In addition, it prevents freeze damage to bronze valve bodies and limits damage to less expensive internal components and provides longer life and more reliable operation
●Instructions: Please apply the supplied grease to the two threads of the bonnet section and the bronze valve. The two pits on the outer ring of the bonnet section are suitable for large wrenches, if necessary, use a suitable tool to tighten
●Applicable Type: Fits FEBCOs Model 765-1 repair kit 1" & 1-1/4" pressure vacuum circuit breakers, #905-212
●Ready-to-Go kit: Includes bonnet, O ring, spring, e-ring, washer, stem, rubber disc, bolts, poppet, and oil bag
●Satisfaction Guarantee: If you encounter any problems, please feel free to contact us. We will do our best to provide you with a 100% satisfaction shopping experience

Description

Here are Two Ways to Determine the Size Kit You Need:

Measure across the bottom of the Poppet ; the distance across the bottom of the Poppet will determine which size kit you need:

1/2" & 3/4" Kits: Poppet measures 1- 1/8" to 1- 3/16" across the bottom (diameter).

1" & 1-1/4" Kits: Poppet measures 1- 7/8" across the bottom (diameter).

1-1/2" & 2" Kits: Poppet measures 3- 7/16" across the bottom (diameter).

Measure across the bottom of the Bonnet Assembly; the distance across the bottom of the Bonnet Assembly (threaded part) will determine which size kit you need:

1/2" & 3/4" Kits: Bonnet Assembly measures 1- 5/16" across the bottom (diameter).

1" & 1-1/4" Kits: Bonnet Assembly measures 2- 3/16" across the bottom (diameter).

1-1/2" & 2" Kits: Bonnet Assembly is made of brass and measures 5- 1/8" across the bottom (diameter).

How to Replace the Bonnet and Poppet ：


Step 1 Close the outlet shut-off valve, then close the inlet shut-off valve to release the water pressure. Then unscrew the top nut and loosen the brass top cap.	Step 2 Place the poppet in the backflow prevention device, apply lubricant to the threads of the bonnet (included in the kit).	Step 3 Install the poppet on the brass guide of the bonnet (slide it in), screw the bonnet into the PVB unit (hand tight only), place the top cover and tighten the nut on the top cover with a wrench.	Step 4 Open the inlet ball valve to pressurize the equipment. Temporary "splash" is normal and "splash" will automatically close once the equipment is fully pressurized. Then slowly open the outlet ball valve and fill the downstream line with water.

Symptom 1: Check valve fails to hold 1.0 PSID minimum

A. Debris on sealing surface or guide surfaces valve surfaces - Disassemble and clean check

B. Damage seat disc - Disassemble and replace seal

C. Weak or broken spring - Disassemble and replace spring

D. Poppet broken due to thermal expansion - Replace broken poppet

Symptom 2: Poppet fails to open at 1.0 PSIG minimum

A. Debris restricting free operation - Disassemble and clean check valve surfaces

B. Poppet seal adhering to bonnet - Disassemble and clean and/or replace damaged parts

C. Weak spring load - Replace bonnet assembly (1/2 - 11/4) or Replace spring (11/2 and larger)

Symptom 3: Minor leakage through air vent

A. Damaged poppet seal - Disassemble and replace seal

B. Cracked or damaged poppet - Disassemble and replace poppet seal

C. Cracked bonnet or damaged sealing edge - Disassemble and replace bonnet assembly

D. Debris on sealing surface - Disassemble and clean

Symptom 4: Significant discharge through air vent

A. Poppet not properly guided - Disassemble and replace damaged parts

B. Major poppet or seal failure - Disassemble and replace damaged parts

C. Low downstream pressure - Check pressure at #2 testcock; should be higher than 5 PSIG if low system

D. Insufficient inlet volume to operate device - Pressure needs to be increased or partially closed outlet ball valve to create higher pressure on poppet.

E. Poppet and or bonnet broken - Replace broken bonnet/poppet due to thermal expansion (see freeze protection)

Symptom 1

Symptom 2

Symptom 3

Symptom 4

Here are Two Ways to Determine the Size Kit You Need:

How to Replace the Bonnet and Poppet ：

Step 1

Step 2

Step 3

Step 4

Symptom 1: Check valve fails to hold 1.0 PSID minimum

Symptom 2: Poppet fails to open at 1.0 PSIG minimum

Symptom 3: Minor leakage through air vent

Symptom 4: Significant discharge through air vent

Product information