Lever Grooved Butterfly Valve

The Lever Grooved Butterfly Valve is designed with a manual lever operating mechanism and grooved clamp connection structure. Compared with traditional flange connection valves, it provides faster installation, easier maintenance, and reliable shut-off performance. It is widely used in fire protection systems, HVAC circulation pipelines, building water supply networks, and municipal engineering projects.

Grooved Connection Design

Fast Installation Without Welding

The grooved connection structure allows the valve to be directly installed through grooved couplings without welding, threading, or complicated flange alignment. This design reduces construction procedures and improves installation efficiency for large-scale pipeline projects.

Compared with traditional connection methods, the grooved structure also simplifies later maintenance. When pipeline repair or valve replacement is required, technicians can remove the valve by loosening the coupling connection without cutting the existing pipeline.

Flexible Pipeline Adaptation

The grooved coupling system provides certain flexibility during pipeline operation. It can compensate for minor pipeline movement caused by thermal expansion, contraction, and installation deviation, helping reduce stress on the pipeline system. This feature makes the valve suitable for fire protection systems, pump rooms, HVAC pipelines, and other applications where pipeline stability is important.

Valve Structure And Operating Performance

Manual Lever Control System

The Lever Grooved Butterfly Valve adopts a 90° rotating lever mechanism, allowing operators to quickly complete valve opening and closing operations.

The handle provides clear position identification, while the locking structure prevents accidental movement caused by vibration or pressure fluctuation. This simple operating design improves safety and reduces maintenance requirements.

Centerline Soft Sealing Structure

The valve adopts a centerline butterfly plate structure combined with EPDM soft sealing technology. The sealing design provides reliable bidirectional shut-off performance and reduces leakage risks during long-term operation.

This structure is commonly applied in clean water systems, fire water pipelines, and HVAC circulation systems.

Material Selection For Different Applications

Standard Water System Configuration

For standard water applications, LIANGFA provides a proven material combination with QT450 ductile iron valve body, epoxy anti-corrosion coating, EPDM sealing seat, and stainless steel stem.

This configuration offers good corrosion resistance, stable sealing performance, and long service life for fire protection pipelines, domestic water supply systems, and cooling water circulation systems.

Customized Material Solutions

Different material combinations can be selected according to operating conditions. The valve disc can be manufactured with ductile iron, SS304, SS316, SS2507, or SS1.4529 materials.

For sealing requirements, LIANGFA provides EPDM, NBR, PTFE, and FKM options to meet different temperature ranges, chemical resistance requirements, and medium conditions.

Working Conditions And Application Matching

Fire Protection Pipeline Projects

The Lever Grooved Butterfly Valve is widely used in fire sprinkler systems, fire hydrant pipelines, fire pump rooms, and fire water supply networks.

The grooved connection method helps shorten installation time during fire protection construction. The reliable soft sealing structure ensures stable shut-off performance required for fire system acceptance.

For projects requiring valve monitoring, LIANGFA can provide signal feedback models that transmit open and closed status information to the fire control system.

HVAC Circulation Systems

In central air conditioning projects, the valve is mainly used in chilled water and cooling water circulation pipelines.

Its compact structure reduces installation space requirements in equipment rooms, ceiling areas, and vertical pipe shafts. The low flow resistance design helps maintain efficient circulation and stable HVAC operation.

Building Water Supply Networks

The valve is suitable for high-rise building water supply systems, basement pump rooms, municipal water supply pipelines, and clean water circulation systems.

The bidirectional sealing structure allows flexible installation and reduces problems caused by incorrect flow direction during construction.

Product Drawing

Model Selection Guide

Pressure Class Selection

LIANGFA provides PN10 and PN16 pressure grades according to different application requirements.

PN16 models are generally preferred for projects with higher pressure requirements and stricter safety standards.

Diameter Selection

The valve range covers DN40-DN1200. For manual lever operation, DN50-DN200 is generally recommended because larger sizes require higher operating force.

Operating Torque And Flow Performance

Manual Operating Torque Data

The operating torque of the valve depends on valve size, pressure difference, sealing material, and working conditions.

The following values are reference data for normal water applications:

Actual torque values may change according to pipeline pressure, medium conditions, and sealing material selection.

For large diameter pipelines or high pressure differential applications, LIANGFA recommends selecting gear-operated grooved butterfly valves to reduce operating force.

Flow Performance Comparison

When fully opened, the butterfly plate creates a smooth flow passage with low pressure loss. Compared with other valve types, it provides a compact structure and efficient flow control for water applications.

Product Comparison

Butterfly Valve Connection Comparison

Manufacturing Reliability

Quality Management System

LIANGFA follows the GB/T19001-2016 / ISO9001:2015 quality management system throughout product design, manufacturing, inspection, and delivery.

Strict production control ensures every valve meets consistent quality requirements before shipment.

Factory Inspection Before Delivery

Before delivery, each valve undergoes material inspection, pressure testing, sealing performance verification, and final appearance inspection.

LIANGFA also provides technical documents, inspection reports, export packaging, and professional support for international customers.

Factory Tour

Product Packing & Shipping

We provide delivery services covering sea freight and land transport, with cargo available for shipment to all major ports worldwide.

Maintenance And Service Support

Easy Replacement And Repair

The grooved connection design makes maintenance faster and more convenient. During replacement or repair, the valve can be removed by disconnecting the coupling without damaging the pipeline.

This advantage is especially valuable for old pipeline renovation projects and systems requiring regular maintenance.

Long-Term Technical Support

LIANGFA provides complete service support covering product selection, technical consultation, customized solutions, spare parts supply, installation guidance, and after-sales assistance.

Through professional service support, customers can maintain stable valve performance throughout the product lifecycle.

FAQ

What Is A Lever Grooved Butterfly Valve Used For?

The valve is mainly used for fire protection pipelines, HVAC circulation systems, clean water supply networks, municipal water projects, and industrial water applications.

Why Choose Grooved Connection Instead Of Flange Connection?

Grooved connection reduces installation time, avoids welding procedures, saves installation space, and makes future maintenance easier.

What Is The Maximum Size For Manual Lever Operation?

Manual lever operation is generally suitable for DN50-DN200. Larger sizes usually require gear operation because of increased operating torque.

How To Select PN10 And PN16 Models?

PN10 is suitable for general low-pressure applications, while PN16 is recommended for fire protection systems, high-rise buildings, and pressurized pipeline networks.