Introduction The wet pipe sprinkler system is the simplest and most common type of fire sprinkler installation.This system employs automatic and closed type sprinkler heads,which are connected to a water-filled piping system.The sprinklers contain either a heat-responsive glass bulb or fusible element that prohibits water from dis-charging from the sprinkler's orifice.The water is contained until such time as the heat from the fire activates the element,causing its release,allowing the water to discharge to the heat source.
Wet systems are frequently installed in factories, warehouses, office buildings, retail stores, and residences where the potential for freezing does not exist.

BV-QR & BVLO-QR Upright, Pendent & Recessed Pendent
K=4.2 & K=5.6 & K=8.0

BV-QR Horizontal Sidewall & Recessed Sidewall
K=5.6

SGQR 3mm Bulb
Upright, Pendent & Recessed Pendent
K=5.6

SGQR 3mm Bulb
Horizontal Sidewall & Recessed Horizontal Sidewall
K=4.2 & K=5.6

SGQR 3mm Bulb
Upright, Pendent & Recessed Pendent
K=4.2

SGQR 3mm Bulb
Upright, Pendent & Recessed Pendent
K=8.0

RFII Standard Response & Quick Response, "Royal Flush II"
Pendent Concealed
K=5.6

TY-L Horizontal Sidewall
K=5.6

TY-L Pendent, Recessed Pendent & Upright
K=5.6 & K=8.0

TY-FRB 3mm Bulb, Quick Response
Pendent, Recessed Pendent & Upright
K=2.8, K=5.6 & K=8.0

TY-FRB 3mm Bulb, Quick Response
Horizontal, Recessed Horizontal Sidewall & Vertical Sidewall
K=5.6

TY-B 5mm Bulb
Pendent, Recessed Pendent & Upright
K=5.6 & K=8.0

TY-B 5mm Bulb
Horizontal, Recessed Horizontal & Vertical Sidewall
K=5.6

TY-FRL with Q-46 Deflector
Horizontal Sidewall
K=5.6

TY-FRL Fast Response
Pendent, Rec. Pendent & Upright Quick Response
K=2.8, 5.6 & 8.0

H Recessed Pendent Sprinkler
K=5.6

A Recessed Pendent
K-2.8, K-4.2 & K-8.0

H Horizontal Sidewall Sprinkler
K=5.6

A Upright & Pendent
K-2.8, K-4.2, K-5.6 & K-8.0

Dry Pipe Valve NAFFCO dry pipe valves are designed for use in dry pipe sprinkler installations in buildings which may be subject to freezing temperatures. A variety of trim packages are available to suit the requirements.

Wet Alarm Valve NAFFCO wet alarm valves are designed for use in wet pipe sprinkler installations in buildings which are not subject to freezing temperatures. A variety of trim packages are available to suit the requirements.

Dry Pipe Sprinkler System dry pipe sprinkler system is a system which employs automatic and closed type sprinkler heads,which are connected to a piping system containing compressed air or nitrogen,rather than water.This type of system is used where the area being protected will be unable to maintain a constant,year-round temperature of at least 40 degrees farenheit.Water would freeze in the piping,rendering the system inoperable,even causing severe damage should the system components crack or break.The water supply for the system is held back by the dry pipe valve,which will only release the water after the evacuation of the air pressure from the system(such as the operation of a sprinkler).The water will then flow into the piping system,and out of the opened sprinklers.
Dry pipe systems are frequently installed in areas subject to freezing temperatures,such as unheated storage areas, coolers and freezers,unheated parking garages,and loading docks.