HG1 - Fire Hydrant Check Valve

Protecting Your Water Resources: An Efficient Solution for Preventing Water Loss from Hydrant Shears

HG1 during normal operation:

HG1 dual plate check valve resides between the water main and the hydrant, allowing nearly full flow capacity when the hydrant is needed.

HG1 immediately following a shear:

When a hydrant is sheared (broken), HG1's breakaway bolts snap and the valve doors spring shut as the hydrant separates from the valve.

HG1 following a hydrant shear:

As the hydrant fully separates from the valve, HG1 effectively shuts off flow from the water main. Only a witness spray remains to alert first responders.

Key Takeaways from the HG1 Dual Plate Unboxing Video:

The HG1 valve is made entirely of stainless steel.

The box (as shipped) includes breakaway bolts, two EPDM gaskets, six grade two hollow breakaway bolts, six nuts going up to the hydrant, six nuts going down to the riser, and twelve stainless steel set screws.

During a strike, the hollow bolts will break, which disconnects the bottom of the hydrant from the top of the valve, allowing the pins to move. The water will then actuate the plates, causing them to close and stop the water, with only a witness stream serving as a signal.