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Wafer Butterfly Valve with Tamper Switch

Technical data

Size: DN50~DN300

Working pressure:PN16/PN25

Valve standard: EN593

Flange standard:ASME-B16.1 Class 125 and EN1092-2

Top Flange standard:EN ISO 5211

Temperature range: 0~80℃

Suitable for indoor and outdoor use

Name of parts Material
Body Ductile iron
Plug EPDM
Driven shaft 1Cr17Ni2
Disc Ductile iron and EPDM
Actuating shaft 1Cr17Ni2
Bearing bush Bronze
O-rings EPDM
Gear operator Ductile iron and steel

Product Detail

Wafer Butterfly Valve with Tamper Switch Definition and Components

A Wafer Butterfly Valve with Tamper Switch Model No. XD371X is a compact, quarter-turn on/off valve primarily used in fire protection systems (sprinkler and deluge systems). The designation "XD371X" typically indicates a specific manufacturer's model for a lugged or wafer-style butterfly valve with a resilient seat and an integral supervisory switch.

Key Terminology:

  • Wafer Style:The valve body is designed to be "clamped" between two pipeline flanges using through-bolts, making it lightweight and space-saving.
  • Tamper Switch (Supervisory Switch):An electrical device mounted on the valve stem that monitors the valve's position. It sends a signal to a fire alarm control panel (FACP) if the valve moves from its normal, open position, indicating unauthorized closure.
  • Butterfly Valve:Flow is regulated by a disc rotating 90 degrees within the pipe bore.

Butterfly Valve for Fire Protection Main Parts:

1.Valve Body (Wafer or Lugged design)

2.Disc (The "butterfly," often ductile iron with epoxy coating)

3.Stem (One-piece or two-piece, connecting disc to actuator)

4.Resilient Seat (EPDM or Nitrile, bonded or mechanically locked in the body)

5.Actuator / Gear Operator (Manual lever, gearbox, or electric/pneumatic actuator)

6.Tamper Switch Assembly:

Switch Housing (Weatherproof enclosure)

Actuating Cam (attached to the stem)

Micro-Switch (SPDT or DPDT)

Conduit Connection

7.Seals and Bushings (Stem seals, bushings)

Role, Characteristics, and Application Scenarios of Wafer Butterfly Valve with Tamper Switch in Pipelines

Functions:

  • Flow Isolation:On/Off control of water in a pipeline.
  • Supervision:Continuous monitoring of valve position for life safety compliance.
  • Alarm Indication:Sends a "trouble" or "supervisory" signal to the FACP upon unauthorized operation.

Fire Protection Butterfly Valves Operational Features:

  • Quick 90° Operation:Lever or gear operator allows fast opening/closing.
  • Compact & Lightweight:Easy to install in tight spaces compared to gate valves.
  • Supervisory Circuit:The switch is typically normally closed (NC) or normally open (NO) in the valve's normal position (open). A change in position breaks the circuit, triggering the supervisory signal.
  • Visual Position Indicator:Lever aligned with pipe = OPEN; lever perpendicular = CLOSED.

Primary Usage Scenarios:

This valve is mandatory in fire sprinkler systems per NFPA 13 and other life safety codes to prevent unintentional valve closure.

Scenario Diagram:

Wafer Butterfly Valve with Tamper Switch Wafer Butterfly Valve with Tamper Switch Wafer Butterfly Valve with Tamper Switch Wafer Butterfly Valve with Tamper Switch Wafer Butterfly Valve with Tamper Switch

Wafer Butterfly Valve with Tamper Switch Standards: Materials, Design, and Connections

Standard Type Primary Standard(s) Purpose & Key Specifications
Design & Performance UL 1091 / FM 1120 / EN 12266-1 Standards for Butterfly Valves for Fire Protection Service. UL/FM listings are required for most North American installations.
Fire System Supervision NFPA 13, NFPA 72 U.S. codes mandating supervised valves. Specify switch type, wiring, and signal requirements.
Material Standards ASTM A536 For ductile iron disc and body (wafer type).
Connection Standard ASME B16.5 / EN 1092-1 Matches flange dimensions of connecting piping (Class 150/PN16 typical). Wafer design conforms to face-to-face dimensions in API 609 or MSS SP-67.
Switch Standard UL 508 (for switch) Standard for industrial control equipment. The assembly should be weatherproof (NEMA 4/IP65).

 

How to Select Wafer Butterfly Valve with Tamper Switch

Step 1: Define Detailed Specifications

Create a technical specification focusing on fire protection requirements:

  • Size & Pressure:Nominal Diameter (e.g., 8") and Pressure Rating (e.g., 175 psi or Class 150).
  • Standards & Listing:Crucially state: "Valve must be UL 1091 Listed and/or FM Approved for fire protection service."
  • Materials:Specify ductile iron body/disc, stainless steel stem, EPDM seat (for water).
  • Tamper Switch:Specify electrical ratings (e.g., SPDT, 5A, 24-240V AC/DC), enclosure rating (NEMA 4X), and conduit entry size.
  • Actuator:Manual lever with locking handle, or gear operator for large sizes.

Step 2: Source and Evaluate Suppliers

  • Source from manufacturers specializing in UL/FM listed fire protection valves.
  • Require submittals including: UL/FM listing certificates, cut sheets, wiring diagram for the switch, and dimensional drawings.
  • Key Evaluation Criterion:Proof of listing for the exact model being supplied. Non-listed valves are not acceptable for code-compliant fire systems.

Step 3: Quality Assurance & Logistics

  • For large projects, consider Factory Witness Testing of the valve and switch operation.
  • Clarify packaging to protect the exposed switch mechanismduring shipment.

Pre-Shipment Inspection for Export Valves and Key Considerations

Inspection Checklist:

Category Check Point Acceptance Criteria
Documentation 1. Certification Listing Valid UL/FM Certificate for the specific model number.
2. Material Certificates MTRs for body, disc, stem.
3. Test Reports Hydrostatic shell/seat test per UL 1091/FM 1120.
Physical/Functional 4. Markings UL/FM listing mark permanently affixed on valve body.
5. Operation & Sealing Smooth 90° operation, no binding. Seat visually intact.
6. Tamper Switch Test CRITICAL: Use multimeter to verify correct switch state change (NO/NC) as valve is operated. Check enclosure integrity.
Packaging 7. Component Protection Lever/actuator locked or secured. Disc blocked in open position.

 

Fire Valve Key Precautions for Export:

  • Moisture Protection for Electronics:Seal the switch housing and include silica gel desiccant in the valve/packaging to prevent condensation damage.
  • Impact Protection:Use custom foam or cardboard to protect the projecting tamper switch assembly from being snapped off. Consider a dedicated wooden crate for larger valves.
  • Position Locking:The valve must be shipped in the FULL OPEN position, with the lever/gear locked if possible.
  • Separate Accessories:Pack any optional switch kits, locks, or special tools in a marked bag inside the main crate.
  • Documentation:Include the UL/FM guide card and installation/wiring manual in a waterproof pouch attached to the crate interior.

Wafer Butterfly Valve with Tamper Switch Size Chart

Dimensions Pressure rating Size(mm)
DN inch psi Ф D L H1 H2 H3 Top Flange
50 2 362 91 43 70 125 103 F05
65 2.5 362 108 46 76 143.5 103 F05
80 3 362 124 46 94 151 103 F05
100 4 362 150 52 108 172 103 F07
125 5 362 178 56 127 190 103 F07
150 6 362 205 56 139 202 103 F07
200 8 232 260 60 175 235 103 F07
250 10 232 313 68 210 265 109 F10
300 12 232 364 78 238 285 109 F10

 

Tag：Fire Protection Butterfly Valve Supplier

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