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Control Valves (OS&Y/Butterfly)

-- Steady & Reliable Manufacturer --

Introduction: Isolation and Supervision of System Water Supply

Control Valves are essential components of fire suppression systems, used to isolate sections of the piping for maintenance, testing, or repair. Most importantly, they act as the gatekeeper for the entire system's water supply. NFPA standards strictly mandate that these valves must be constantly supervised to ensure they are always in the open position, guaranteeing water is available when a fire occurs.

We supply the two most common types: the Outside Stem and Yoke (OS&Y) Gate Valve and the Supervised Butterfly Valve. The OS&Y valve visually indicates its position by the height of its stem—if the stem is up, the valve is open. The Butterfly valve is more compact and uses an electrical tamper switch connected to the Fire Alarm Control Panel (FACP) to confirm its open status.

All our control valves are UL Listed and FM Approved, ensuring their pressure integrity and tamper switch reliability meet the most demanding fire safety and insurance requirements. They are available in flanged, grooved, or threaded connections in all standard sizes. (Approx. 520 words)

Advantage: Supervised Reliability and Easy Operation

  • Visual Indication (OS&Y): The exposed stem offers a clear, immediate visual check of the valve's status, which is highly valued for simple supervision.
  • Tamper Supervision: Both valve types include NFPA-compliant tamper switches that send a "trouble" signal to the FACP if the valve is turned more than a few turns from the open position.
  • Fusion-Bonded Epoxy Coating: High-quality internal and external epoxy coating provides excellent long-term corrosion resistance, essential for water supply lines.
  • Low Pressure Drop: Gate valves (OS&Y) offer minimal resistance (full port opening) when fully open, ensuring maximum flow efficiency to the system.
  • Compact Design: Butterfly valves provide a much smaller footprint and lighter weight solution, ideal for installations in tight spaces like pump rooms or vertical risers.
  • Durable Materials: Ductile iron construction ensures the valve body can withstand high system pressures and seismic loading.

Specification: Type, Connection, and Supervision

Valve Type OS&Y Gate Valve, Supervised Butterfly Valve
Nominal Size Range 2 inch to 12 inch (DN50 to DN300)
Material Ductile Iron (Body), Bronze/Stainless Steel (Stem/Disc)
Connection Flanged, Grooved End, or Threaded
Pressure Rating 175 psi to 300 psi (PN16 to PN25)
Supervision Visual (OS&Y Stem) or Electrical Tamper Switch (Butterfly/OS&Y)
Standard Compliance NFPA 13/25, UL Listed, FM Approved, AWWA Standard
Coating Fusion-Bonded Epoxy (Internal and External)

Critical Roles in System Isolation and Control

Riser Control Valve

Installed on the main system riser pipe to isolate the entire floor or building system from the primary water source for maintenance.

Sectional Isolation

Used to divide a large system into smaller, manageable zones, allowing part of the system to remain operational during partial maintenance.

Fire Pump Discharge

Heavy-duty, flanged control valves used on the fire pump discharge side to isolate the pump for service and testing.

Testing and Drainage

Smaller control valves used on drain lines, test connections, and inspector's test assemblies.

Fire Hydrant Isolation

OS&Y valves or buried non-rising stem valves used on the water main loop to isolate specific fire hydrants.

Grow Your Bussiness With KAITUO

  • INNOVATION

    Professional R&D Team

    We have a professional R&D team of over 15 people who are able to provide innovative products and customized design services to our customers.

  • QUALITY

    Product quality assurance

    We adhere to quality as a lifeline for our business development, and strict quality management systems ISO and CE, as well as a variety of advanced quality testing equipment are our guarantees for product quality.

  • PRODUCTION CAPACITY

    Annual output exceeds 400,000

    Every month over 400,000 pcs of kinds of valves, including fire extinguisher valve, lpg valve, marine gas cylinder valve and so on.

  • SERVICE

    One-stop service

    We have complete design, and product development, testing and quality control are all carried out in the factory, which to a certain extent guarantees the high quality and performance of Kaituo fire equipment.

Payment & Shipping: Flexible Global Trade Solutions

We offer comprehensive and secure international trade terms tailored to our global clientele.

  • Accepted Payment Methods:

    Wire Transfer (T/T): Standard 30% deposit to confirm the order, 70% balance upon presentation of Bill of Lading (B/L) copy.

    Letter of Credit (L/C): Irrevocable L/C at sight for large orders, providing maximum financial security for both parties.

  • Shipping Terms (Incoterms):

    FOB (Free On Board): Ningbo Port is our standard shipping hub.

    CIF/CFR: Available upon request; we manage shipping logistics to your designated port.

  • Packaging:

    Valves are individually crated or secured on pallets. Tamper switches and wiring are protected and packaged separately.

Comprehensive Information Summary

Minimum Order Quantity (MOQ) 20 Units (OS&Y), 50 Units (Butterfly)
Lead Time 45-70 Days (Casting, Machining, Epoxy Coating, and Assembly)
Packaging Individual Crates or Secure Pallets, Tamper Switches Protected.
Certifications UL Listed, FM Approved, AWWA C515/C509, ISO 9001.
Raw Materials Ductile Iron, Stainless Steel, Bronze, Fusion-Bonded Epoxy.
Customization Options Connection Type (Flanged/Grooved), Pressure Class, Electrical Connection Standard (Tamper Switch), Anti-Freeze Option.

Professional Usage Tips

  1. Tamper Switch Test:

    The valve must be turned enough to signal a trouble alarm to the FACP. This test must be performed quarterly or annually, per NFPA 25 requirements.

  2. Full Open Position:

    After maintenance, the valve must be opened fully, then typically backed off half a turn, to ensure the gate/disc is completely clear of the waterway and is correctly seated on the tamper switch.

  3. Lubrication:

    For OS&Y valves, the stem threads should be periodically cleaned and lubricated (NFPA 25) to ensure smooth operation when required for isolation.

  4. Drain Connection:

    Always confirm that the system drain valve downstream of the control valve can fully drain the section of pipe for servicing.

  5. Grooved Coupling Alignment:

    When installing grooved control valves, ensure the couplings are correctly aligned and the bolts are torqued evenly to prevent flange distortion or leaks.

Get in Touch

ABOUT KAITUO
Ningbo Kaituo Valve Co., Ltd., also known as Ningbo Anke Fire Equipment Co., Ltd., is China Control Valves (OS&Y/Butterfly) Manufacturers and Wholesale Control Valves (OS&Y/Butterfly) Factory, specializing in the research and development, production and export of fire equipment. It owns the anke brand and a number of national high-tech patents.
Founded in 2001, our company mainly provides high-quality fire protection products for the international market, specializing in the production of various types of fire extinguisher accessories, marine gas cylinder valves, gas valves, etc. After years of hard work and continuous improvement of process reform, our products are exported to dozens of countries around the world and have won a good international reputation. All of our products have obtained the EU EN, CE certification in 2007.
Welcome all customers to call and visit us. Our company has a professional sales team to provide accurate services.
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FAQ

The tamper switch is a critical supervisory device. It alerts the fire alarm panel if the valve is closed or partially closed, preventing a massive system failure (no water supply) during a fire.

No. Per NFPA 13, all isolation control valves must be supervised (electrically or physically locked) to ensure they remain open, unless they are dedicated test/drain valves.

Butterfly valves are generally maintenance-free. OS&Y valves require periodic lubrication of the stem to prevent seizing and ensure easy operation.

This small valve assembly allows a controlled flow of water equivalent to the discharge of one sprinkler head, used for both drainage and functionally testing the flow switch.

A Butterfly valve always has the valve disc sitting in the center of the waterway, creating a slight obstruction and therefore a higher pressure drop (lower C-factor) than a full-port OS&Y valve.

The position is checked by the tamper switch attached to the valve stem housing, which monitors the rotation of the disc.

Yes, OS&Y valves and Butterfly valves are designed to be installed either horizontally or vertically on the riser pipe.

The MOQ for a standard supervised Butterfly valve is typically 50 units.

AWWA (American Water Works Association) certification indicates the valve is also approved for use on municipal water mains and public supply lines.

Yes, the tamper switch (often NEMA rated) and the yoke assembly for mounting are included with the purchase of the supervised control valve.