Sprinklers & Alarm Valves

ZSTDY Concealed Fire Sprinkler (Recessed)

ZSTDY concealed (recessed) fire sprinkler with electroplated chrome finish and decorative cover plate for high-end ceiling installations. Stainless steel construction with 68°C red glass bulb, UL listed.

Key Features

Concealed design with decorative cover plate for premium ceilings
Electroplated chrome finish, stainless steel construction
68°C (155°F) red glass bulb temperature rating
Thread & gasket sealing for leak-free installation
UL listed, ideal for high-end ceiling applications

Technical Specifications

Model: ZSTDY
Size Range: DN15 - DN20 (1/2" - 3/4")
Material: Stainless Steel
Temperature Rating: 68°C (155°F)
Finish: Electroplated Chrome
Certification: UL Listed
Application: Concealed Ceiling Fire Sprinkler Systems

Parts & Materials List

Sprinkler Body: Stainless Steel
Bulb: Glass (Red Liquid, 68°C)
Escutcheon / Cover: Brass with Chrome Finish

Applications

Automatic sprinkler systems
Commercial and residential buildings
Industrial warehouses
High-hazard deluge and pre-action systems

Quality & Testing

Pressure and leakage testing per GB 5135 series; alarm sensitivity verified with flow switches and alarm gongs.

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Frequently Asked Questions

What is the difference between a wet alarm valve and a deluge valve?

A wet alarm valve (ZSFZ) keeps the sprinkler piping filled with water and triggers the alarm on water flow. A deluge valve (ZSFM) stays closed under air or water pressure and floods the system only when a fire detection signal opens it - used for high-hazard areas requiring immediate large water discharge.

What standards do the sprinkler system components comply with?

Components are manufactured and tested in accordance with GB 5135 series and, on request, other international standards. Confirm the applicable standard for your project with our engineers.

What is the working pressure of the alarm valves?

Standard working pressure is 1.6 MPa with a testing pressure of 3.2 MPa. Size ranges typically cover DN50 to DN300 depending on the model.

Can the alarm valve groups be integrated with existing fire detection systems?

Yes. Deluge and pre-action valves support mechanical, pneumatic or electrical (DC24V solenoid) remote triggers and can be integrated with most fire alarm control panels.