Valve Tamper Switch
Materials of Metric Roller Chain Sprocket
Valve Tamper Switch is a critical component in fire safety infrastructure, specifically designed to monitor control valves within fire sprinkler systems. This type of valve supervisory switch provides a reliable, 24/7 monitoring solution for the open position of OS&Y gate valves, ensuring the water supply system remains operational and ready for use. Should a valve be inadvertently closed, tampered with, or moved more than a couple of turns from its fully open position, the device immediately activates, sending a dedicated supervisory signal to the fire alarm control panel. Featuring a robust, weatherproof enclosure suitable for both indoor and outdoor installation, along with a tamper-resistant design utilizing special security screws, this fire valve monitoring device helps maintain system integrity and compliance with essential safety standards.
Key Features & Benefits
Robust Construction for Harsh Environments
Durable Housing: The enclosure features robust die-cast metal construction with a resilient, corrosion-resistant powder coating finish. This design ensures protection against environmental factors, making it suitable for both indoor and outdoor installations.
Environmental Sealing: Designed to meet high ingress protection standards, the unit is dust-tight and protected against water exposure, including temporary submersion, ensuring reliable operation in wet or dusty locations.
Tamper-Resistant Mechanism: The cover is secured with specialized, tamper-resistant screws, requiring a specific tool for removal. This prevents casual interference or vandalism, ensuring the switch remains operational and secure.
Versatile Installation & Compatibility
Wide Valve Compatibility: The adjustable mounting bracket system is engineered to fit a broad range of standard OS&Y valves, typically accommodating sizes from 2 inches up to 12 inches, and sometimes even smaller valves down to 1/2 inch.
Adjustable Actuator Rod: The length of the actuator rod is adjustable, which eliminates the need for cutting the shaft during installation and allows for precise positioning to match the specific movement range of the valve stem.
User-Friendly Mounting: The design focuses on ease of installation, featuring a user-friendly mounting bracket that simplifies the fitting process onto existing valve yokes.
Reliable Monitoring & Signalling
High-Capacity Contacts: The internal switch mechanism utilizes robust SPDT (Single-Pole, Double-Throw, also known as Form C) contacts, capable of handling significant electrical loads (e.g., up to 10.0 Amps at 125/250 VAC and 2.0 Amps at 30VDC).
Dual Switch Option: Available in models offering either one or two sets of independent contacts, providing flexibility to signal both a local alert and a remote monitoring station simultaneously.
Visual Indicators: Internal visual switch indicators confirm the contact status during setup and testing, aiding in quick verification of correct operation.
Multiple Conduit Entrances: Equipped with multiple entrances for wiring conduit, simplifying the connection process and ensuring a neat, protected wiring path.
Technical Specifications (Typical Values)
| Feature | Specification |
| Switch Category | Valve Supervisory Switch |
| Enclosure Material | Cast alloy base and cover, finished with a durable red powder coating |
| Operating Temp. | -40℃ to 60 ℃ (-40°F to 140°F) |
| Mounting | Adjustable bracket for OS&Y valves (1" to 12" diameters) |
| Conduit Entry | Single-sided inlet designed for 1/2" conduit |
| Contact Specifications |
OSYSU-1: 1 Set of SPDT (Form C) OSYSU-2: 2 Sets of SPDT (Form C) 10.0 Amps at 125/250 VAC 2.0 Amps at 30VDC Resistive 10 mAmps minimum at 24 VDC |
| Weight | 798 grams / 1.76 pounds |
Applications
Our valve tamper switch is an indispensable safety device across a variety of sectors where reliable fire suppression systems are paramount:
■ Public Buildings: In crowded places like hospitals, schools, theaters, and stadiums, this switch is a mandatory safety device used to monitor the integrity of the fire water supply chain in real-time.
■ High-Rise Residential Buildings and Apartments: Applied to fire pump rooms and floor riser control valves in high-rise constructions, ensuring an unobstructed water supply during a fire event.
■ Industrial Facilities: Ensures that critical valves within the fire system piping networks of factories, warehouses, and manufacturing plants are always in the fully open position, safeguarding production areas.
■ Commercial Complexes: Used in the automatic sprinkler systems of large shopping malls, office buildings, and hotels to monitor the status of main water supply valves and zone control valves, preventing unauthorized closures.
Installation and Operation Principles
The installation process is designed to be straightforward for qualified technicians. The core principle of operation is simple yet effective:
1. Mounting: Attach the bracket assembly to the valve yoke, ensuring it does not interfere with normal valve movement.
2. Actuator Alignment: Only when the valve is fully open, seat the adjustable actuator rod into the stem's groove.
3. Testing: Simulate a valve closure to verify the alarm signal is sent to the monitoring panel.
Frequently Asked Questions
Q: What is the recommended maintenance schedule for the switch?
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A: Beyond the required quarterly operational testing, general maintenance involves ensuring the area around the switch and valve stem remains clear of debris and performing a visual inspection annually to check for corrosion or physical damage. The weatherproof seals should also be inspected periodically.
Q: What should I do if the switch provides an intermittent supervisory signal?
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A: An intermittent signal often indicates a mechanical issue. First, check that the valve is indeed fully open and locked in place. Then, inspect the actuator rod and mounting bracket alignment to ensure smooth travel. Finally, verify the wiring connections within the enclosure are secure and free from moisture or corrosion. If the issue persists, the internal microswitch might need replacement.
Q: Are there any specific considerations for use in extremely cold temperatures?
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A: The device is rated down to -40°F (-40°C). While the electronics and mechanism are designed to withstand this, in environments with extreme condensation and subsequent freezing, care should be taken to ensure ice buildup does not impede the mechanical movement of the actuator rod or valve stem. Proper conduit sealing helps prevent moisture entry that could freeze internally.
Q: Are additional accessories like J-hooks included or needed for installation?
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A: The standard mounting hardware is included for typical 2-inch to 12-inch OS&Y valves. For installing the switch on smaller valves (e.g., 1/2-inch to 1.5-inch), specific J-hook accessory kits are usually required and must be purchased separately.
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