Wafer Butterfly Valve with Lever Handle

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℃

Name of parts	Material
Body	Ductile iron
Plug	EPDM
Driven shaft	1Cr17Ni2 or 2Cr13
Disc	Ductile iron and EPDM
Actuating shaft	1Cr17Ni2
Bearing bush	Bronze
O-rings	EPDM
Lever handle	Ductile iron and steel

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Product Detail

Wafer Butterfly Valve with Lever Handle Definition and Components

A Wafer Butterfly Valve with Lever Handle Model No. D71X is a compact, economical, quarter-turn shut-off valve designed for general service in water, air, and other neutral media. The model number "D71X" is a common industry designation where "D" often signifies a butterfly valve, "71" indicates a wafer body with a lever-operated, resilient-seated design, and "X" denotes a rubber (elastomer) liner/seal.

Fire Butterfly Valve Key Features:

Wafer Body:Designed to be sandwiched between two pipeline flanges using through-bolts. It is not intended to be used as an end-of-line valve or to absorb significant pipeline loads.
Lever Handle:Provides a simple, manual 90° operation with clear visual position indication.
Resilient Seat:An elastomer (like EPDM or NBR) is either bonded to the body or forms a sleeve, creating a tight seal against the disc.

Main Parts:

Valve Body (Wafer type, typically ductile iron or cast iron)
Disc (The rotating closure member, often in a concentric design)
Stem (One-piece shaft connecting disc to handle)
Resilient Seat/Liner (Elastomer seal integrated into the valve body)
Lever Handle (with position indicator and optional locking plate)
Stem Seals and Bushings (Prevent leakage along the stem)
Fasteners (Internal pins or screws securing handle to stem)

Role, Characteristics, and Application Scenarios of Wafer Butterfly Valve with Lever Handle in Pipelines

Fire Valve Functions:

On/Off Isolation:Basic shut-off service in low-to-medium pressure systems.
Flow Regulation:Can be used for moderate throttling, though not as precise as a globe valve.
Directional Service:Suitable for bidirectional flow.

Operational Features:

Quick 90° Operation:Lever moves from fully open (parallel to pipe) to fully closed (perpendicular) in a quarter-turn.
Visual Position Indicator:Lever clearly shows valve status.
Compact & Lightweight:Saves space and weight compared to gate or globe valves.
Self-Limiting Handle:Typically includes a stop to prevent over-rotation.
Low Cost:Economical solution for basic service.

Primary Usage Scenarios:

This valve is ubiquitous in commercial, institutional, and light industrial systems where cost-effectiveness and simple operation are key. It is generally NOT for critical, high-pressure, high-temperature, or fire protection services.

Scenario Diagram:

Fire Butterfly Valve

Wafer Butterfly Valve with Lever Handle Standards: Materials, Design, and Connections

Standard Type	Primary Standard(s)	Purpose & Key Specifications
Design & Dimensions	ISO 5752	Basic series: Specifies face-to-face dimensions for metal-seated and resilient-seated butterfly valves. This is the most common reference for D71X style valves.
Performance Testing	ISO 5208 / EN 12266-1	Standard leakage rates and pressure tests for valve assessment. Rate "A" is common for resilient-seated valves.
Material Standards	ASTM A536	For ductile iron body and disc.
		ASTM A276 304/416 SS for stem.
		ASTM D2000 for elastomer compounds (EPDM, NBR).
Connection Standard	ASME B16.5 / EN 1092-1	Matches flange standards of the connecting pipeline (Class 150/PN16 typical). The wafer body fits standard flange drillings.
Face-to-Face	API 609 / MSS SP-67	Alternative design standards that also define dimensions for double-flanged, lug, and wafer butterfly valves.

How to Select Wafer Butterfly Valve with Lever Handle

Step 1: Define Detailed Specifications

Clarify the application to ensure the D71X is suitable.

Media, Temperature, & Pressure:State fluid type, max temperature (e.g., 80°C for EPDM), and working pressure (e.g., 10 bar/150 psi).
Size & Connection:Nominal Diameter (e.g., DN100) and flange standard (e.g., ANSI 150 RF).
Materials:Specify body/disc material (e.g., Ductile Iron), seat elastomer (e.g., EPDM for water, NBR for oils), and stem material (e.g., Stainless Steel).
Operation:Lever handle. Specify if a locking device or gear operator is needed for larger sizes (>DN200).
Standards:Reference ISO 5752 for dimensions.

Step 2: Source and Evaluate Suppliers

Source from general valve manufacturers or distributors. Quality can vary significantly.
Request product data sheets confirming materials, pressure/temperature ratings, and test standards.
For critical applications, request sample test reports or consider a lower-cost third-party inspection.

Step 3: Logistics and Documentation

These are often bulk/stock items. Confirm lead times and MOQ (Minimum Order Quantity).
Required docs are simpler: Commercial Invoice, Packing List, and a general Certificate of Compliance. MTRs may not be standard but can be requested.

Pre-Shipment Inspection for Export Wafer Butterfly Valve with Lever Handle and Key Considerations

Fire Protection Butterfly Valves Inspection Checklist:

Category	Check Point	Acceptance Criteria
Documentation	1. Packing List	Must match quantity, size, and model shipped.
	2. Certificate of Conformity	General statement of meeting specs.
Physical/Functional	3. Visual & Material Check	No major casting defects. Paint/coating intact.
	4. Operation Test	CRITICAL: Lever must operate smoothly through full 90° arc without binding. Disc should not rub in open/close positions.
	5. Dimensional Spot Check	Verify face-to-face length and flange diameter are within tolerance.
	6. Marking	Body should be cast/stamped with size, pressure rating, material, and direction arrow.
Packaging	7. Protection	Disc should be in closed position. Flange faces and stem protected with cardboard/plastic.

Key Precautions for Export:

Bulk Packaging:Valves are often palletized and shrink-wrapped. Ensure they are stacked securely to prevent crushing. Use corner protectors on pallets.
Rust Prevention:For carbon steel stems or bare iron surfaces, ensure a light anti-rust oil is applied, especially for sea freight.
Handle Protection:The protruding lever handle is vulnerable. Ensure packaging design prevents lateral impacts that could bend the handle or stem.
Simple Documentation:Include clear packing lists inside a waterproof pouch on the pallet. For mixed shipments, mark boxes clearly by size and model.

Wafer Butterfly Valve with Lever Handle Size Chart

Dimensions		Pressure rating	Size(mm)
DN	inch	PN	Ф D	L	H1	H2	H3	Top Flange
50	2	10/16/25	91	43	70	125	39	F05
65	2.5	10/16/25	108	46	76	143.5	39	F05
80	3	10/16/25	124	46	94	151	39	F05
100	4	10/16/25	150	52	108	172	39	F07
125	5	10/16/25	178	56	127	190	39	F07
150	6	10/16/25	205	56	139	202	39	F07
200	8	10/16/25	260	60	175	235	39	F07

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