Sprinklers & Alarm Valves

Glass Bulb Fire Sprinkler (ZST Series)

Precision-engineered automatic fire sprinklers featuring highly sensitive glass bulb. Ideal for hotels, commercial malls, residential complexes, and industrial warehouses to detect and suppress fires instantly.

Key Features

High-strength copper alloy framework precision forged for durability
Highly sensitive organic liquid glass bulb ensures quick response
Premium aging-resistant O-ring seals prevent leakage over decades
Polished and chrome-plated surface for a sleek decorative appearance

Technical Specifications

Nominal Diameter: DN15 (R1/2") / DN20 (R3/4")
Flow Coefficient: K=80 ±4 / K=115 ±9
Response Types: Standard Response (5mm bulb) / Quick Response (3mm bulb)
Temp Ratings: 57°C / 68°C / 79°C / 93°C / 141°C
Types Available: Pendent (下垂), Upright (直立), Sidewall (边墙)

Parts & Materials List

Body Frame: Precision Forged Brass (H59-1)
Glass Bulb: German Imported Job / Day-Impex Glass Bulb
Sealing Element: Stainless Steel O-Ring with Teflon Layer
Deflector/Splat: Copper Alloy / Stainless Steel

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

How do I choose between K=80 and K=115 sprinkler heads?

K=80 (K=80±4) is the standard choice for most light and ordinary hazard rooms; K=115 (K=115±9) delivers higher flow where the design density is higher. Your sprinkler hydraulic calculation sets the required K-factor and flow at operating pressure.

What temperature ratings are available for ZST sprinklers?

57°C, 68°C, 79°C, 93°C and 141°C glass bulb ratings with standard bulb colour coding, so the head opens within the temperature band your hazard class requires.

What is the difference between quick response and standard response bulbs?

Quick response heads use a 3 mm bulb and react faster — preferred where fast action matters; standard response heads use a 5 mm bulb and are the general-purpose default.

Which orientations are available in the ZST family?

Pendent, upright and sidewall ZST models, plus the horizontal sidewall (T-ZSTBS) and recessed concealed (ZSTDY) variants for finished-ceiling installations — precision forged brass bodies with imported glass bulbs in DN15/DN20.