UL/FM Pressure Switch

Model: ZSJY 1.6BP
Date Updated: August 17, 2026
Prepared by: Fire Protection Valve Technical Department

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Ningjin APC Industries is a premier UL & FM certified manufacturer in China, delivering high-performance industrial and fire protection valves built to strict international safety standards.

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UL/FM Pressure Switch

▏Product Description

The ZSJY 1.6BP Pressure Switch engineered by Ningjin APC Industries is a high-precision waterflow alarm and supervisory device manufactured specifically for commercial, industrial, and municipal fire protection systems. Built with a heavy-duty YZAlSi11Cu3 aluminum alloy outer cover and IP66 waterproof enclosure, this 300PSI maximum working pressure switch automatically detects system pressure changes in wet pipe, dry pipe, pre-action, and deluge fire sprinkler systems. Featuring double SPDT switch contacts rated at 15 Amps under 125/250 VAC, double EPDM diaphragms, and tamper-proof fasteners, the unit delivers reliable electrical signal transmission to fire alarm panels during emergency activations. Designed with a 1/2" NPT wiring inlet and pre-set 1 PSI differential pressure, this 300PSI double SPDT pressure switch for fire sprinkler systems provides dependable operational safety for fire protection engineers, EPC contractors, and system maintenance managers worldwide. Custom-manufactured with a standard 45 working days lead time, each unit delivers robust performance for fire safety networks across North America and the Middle East.

▏Technical Features

Parameter Item	Specification / Value
Dimension	121mm(4 3/4")57mm(2 1/4")111mm(4 3/8")
Wiring Inlet Size	1/2" NPT
Differential Pressure Setting	1 PSI (cannot be adjusted after consignment)
Maximum Working Pressure	300PSI
Switch Contact	double SPDT
Contact Capacity	15 Amps under 125/250 VAC, 2.5 Amps under 30 VDC
Dust Proof and Waterproof Lever	IP66
Working Temperature Range	-40~60°C/-40~140°F
Outer Cover Protection	Tamper proof fasteners on outer cover

▏Technical Specifications

NO.	Name	Qty	Material
1	Outer Cover	1	YZAlSi11Cu3
2	Bolt	2	Q235
3	2-Micro Switch	2	Assembly
4	Calibration Sticker	1	PET
5	Regulating Screw	1	Reinforced Nylon
6	Base	1	Q235
7	Joint	1	Reinforced Nylon
8	Galvanized Inner Plum Tapping Screw	2	20Mn
9	Green Slotted Screw with Hexagon Head	1	Q235
10	Tamper-proofing Screw	2	D667
11	Incoming Line Coil	1	PE-LD
12	Gasket Seal	1	EPDM
13	Diaphragm	2	EPDM
14	Connecting Base	1	Reinforced Nylon
15	Flat Washer	2	06Cr18Ni11Ti
16	Regulating Spring	2	60Si2MnA
17	Pushrod	2	Reinforced Nylon
18	Bracket	1	Q235

▏Frequently Asked Questions

1. What are the primary functions and system applications of the ZSJY 1.6BP Pressure Switch in fire protection systems?

The ZSJY 1.6BP Pressure Switch manufactured by Ningjin APC Industries is a high-precision waterflow alarm and supervisory switch designed specifically for fire protection sprinkler systems. Operating at a maximum working pressure of 300PSI, this device detects positive pressure changes in automatic fire sprinkler piping and signals fire alarm panels or actuates water motor gongs. Engineering designers and EPC contractors integrate this device in wet pipe, dry pipe, pre-action, and deluge valve alarm trim assemblies. Featuring a double SPDT switch contact setup and robust IP66 dust-proof and waterproof enclosure, the unit ensures dependable electrical signaling across operating ambient temperatures ranging from -40°C to 60°C (-40°F to 140°F). Specifying a 300PSI double SPDT pressure switch for fire sprinkler systems provides reliable real-time supervisory protection for commercial, industrial, and institutional fire safety infrastructure worldwide.

2. How do the switch contacts and contact capacity operate under electrical loads?

The ZSJY 1.6BP pressure switch incorporates double SPDT (Single Pole Double Throw) switch contacts, providing dual electrical circuit control for versatile fire alarm and signaling configurations. The electrical switch contacts feature a rated contact capacity of 15 Amps under 125/250 VAC and 2.5 Amps under 30 VDC, allowing direct connection to centralized fire alarm control panels, auxiliary alarm bells, or local signaling equipment. Housed in a durable YZAlSi11Cu3 outer cover, the assembly achieves an IP66 dust-proof and waterproof rating, safeguarding electrical contacts against harsh environmental conditions, moisture ingress, and dust accumulation. For fire system operators and maintenance managers seeking a high capacity IP66 fire alarm pressure switch, this specification guarantees long-term contact reliability and immediate alarm activation during pressure fluctuation events.

3. What are the installation requirements and differential pressure settings for the ZSJY 1.6BP model?

Installation of the ZSJY 1.6BP pressure switch requires connection via its 1/2" NPT wiring inlet size, allowing straightforward conduit attachment in fire riser rooms and pump stations. The device is pre-calibrated with a differential pressure setting of 1 PSI, which cannot be adjusted after consignment to maintain factory-certified precision and prevent field tampering. With compact overall dimensions of 121mm x 57mm x 111mm (4 3/4" x 2 1/4" x 4 3/8"), the switch mounts easily in tight riser configurations. When submitting a ZSJY 1.6BP fire pressure switch RFQ, procurement officers can specify project quantity requirements while receiving factory-tested units ready for rapid field mounting, minimizing overall installation time and commissioning overhead.

4. What materials are used in the technical specifications to ensure long-term mechanical reliability?

The ZSJY 1.6BP pressure switch utilizes a carefully engineered Bill of Materials (BOM) designed for durability and environmental resistance in demanding fire protection environments. The outer protective cover is constructed from YZAlSi11Cu3 aluminum alloy, secured by D667 tamper-proofing screws to prevent unauthorized adjustment. Internal pressure-sensing components include dual EPDM diaphragms and an EPDM gasket seal, delivering chemical stability and fluid tightness under 300PSI working pressure. Additional structural elements—such as the Q235 steel base and bracket, reinforced nylon regulating screws and pushrods, 60Si2MnA regulating springs, and 06Cr18Ni11Ti flat washers—ensure mechanical stability. Reviewing these EPDM diaphragm fire pressure switch BOM specifications confirms that every component is built to withstand mechanical stress, corrosion, and extreme temperature variations from -40°C to 60°C.

5. What lead time and B2B ordering support does Ningjin APC Industries offer for international procurement?

Ningjin APC Industries serves as a premier B2B manufacturer and exporter of commercial fire protection equipment, delivering custom-manufactured valves and pressure switches to major contractors across North America and the Middle East. Standard manufacturing lead time for custom production orders is 45 working days from order confirmation. Every unit undergoes rigorous quality testing and inspection before shipment, packaged with protective incoming line coils and PET calibration stickers. Engineering contractors and international distributors looking to buy 300PSI pressure switch directly from manufacturer gain access to direct factory pricing, full technical compliance support, and comprehensive material certification. Our technical team works closely with project buyers to ensure smooth logistics, custom order tracking, and reliable delivery schedules.

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