HH48X Micro-resistance Slow-closing Butterfly Check Valve, Ductile Iron Silent Slow-closing Check Valve for Water Hammer Prevention

HH48X Micro-resistance Slow-closing Butterfly Check Valve, Ductile Iron Silent Slow-closing Check Valve for Water Hammer Prevention

HH48X Low Resistance Slow Closing Butterfly Check Valve is an automatic control valve integrating low resistance energy saving, slow closing anti-water hammer, noise reduction, and backflow prevention. Made of ductile iron valve body, it is specially designed for water pump outlets, tap water pipelines, municipal water supply and drainage, sewage treatment and other fields. It can effectively eliminate the impact of pump stop water hammer on pipelines and equipment, reduce operating noise, and prevent backflow from damaging water pumps. The factory direct supply model eliminates intermediate links, providing both cost-effectiveness and quality assurance, making it a core protective equipment for the safe and stable operation of pipeline systems.

I. Model Meaning

Example: HH48X-16Q refers to a low resistance slow closing butterfly check valve with nominal pressure 1.6MPa, ductile iron valve body, flanged connection and rubber soft seal, suitable for most municipal and industrial water supply and drainage scenarios.

II. Core Structural Features

1. Slow Closing & Anti-Water Hammer, Double Protection for Pipes and Pumps

Adopting hydraulic damping slow closing mechanism combined with spring return design, when the pump stops or medium backflows, the valve disc first closes 80% of the stroke quickly, and the remaining 20% stroke closes slowly through hydraulic damping (slow closing time can be adjusted 3~60S). It effectively buffers the impact force of medium backflow, completely eliminates destructive water hammer, avoids hidden dangers such as pipe rupture and water pump reverse damage, and protects the safe operation of the entire pipeline system.

2. Ductile Iron Valve Body, Durable and Corrosion Resistant

The valve body is integrally cast with QT450-10 ductile iron, treated by high-temperature annealing, with high tensile strength, good toughness, and not easy to crack or deform. The inner and outer surfaces are sprayed with epoxy resin powder, which is rust and acid-base resistant, suitable for various media such as clean water, sewage and seawater, with a service life of more than 10 years, adapting to complex working conditions.

3. Low Resistance Energy Saving, Noise Reduction

Butterfly structure design, the flow channel is straight-through. When opened, the valve disc is parallel to the flow channel, with extremely small flow resistance (resistance coefficient ≤0.5), which can reduce the energy consumption of water pump operation and save operating costs. The slow closing process is stable without impact, avoiding water hammer noise generated when traditional check valves are closed, and the noise during operation is ≤55dB, suitable for residential areas, office buildings, pump stations and other scenarios with high noise requirements.

4. Rubber Soft Seal, Zero Leakage Guarantee

The valve seat is integrally vulcanized with EPDM or NBR, closely fitting with the butterfly disc to achieve bidirectional sealing. The sealing surface is precision machined without burrs or scratches to ensure zero leakage. At the same time, the rubber material is temperature and aging resistant, meeting drinking water hygiene standards and can be used in tap water transmission systems.

5. Automatic Operation, Easy Maintenance

It opens and closes automatically relying on medium pressure, no manual operation is required, with sensitive response and no jamming. Built-in filter can prevent debris from entering the slow closing mechanism and reduce the occurrence of faults. Compact structure, small size and light weight, easy to install and disassemble. Daily maintenance only needs to regularly check the seals and slow closing mechanism, with low maintenance cost.

6. Factory Direct Supply Advantages

Produced by the source factory, eliminating intermediate links such as distributors and agents, with more advantageous prices; supports customization on demand (such as nominal pressure, seal material, slow closing time), and can be accurately matched according to customer working conditions; provides perfect after-sales guarantee, 1-year warranty, and professional technical team to guide installation, commissioning and maintenance on site.

III. Key Technical Specifications

IV. Working Principle

HH48X Low Resistance Slow Closing Butterfly Check Valve is designed based on the synergistic working principle of medium pressure, hydraulic damping and spring return, realizing automatic opening and closing and slow closing anti-water hammer function without external power. The specific process is divided into three stages:

1. Forward Operation Stage: When the medium flows forward, the butterfly disc is smoothly opened by the pressure of the medium itself. The butterfly disc is parallel to the flow channel, with minimal flow resistance, ensuring smooth passage of the medium. At this time, the hydraulic mechanism is in the energy storage state.

2. Pump Stop/Backflow Stage: When the water pump stops or the medium backflows, the medium pressure drops instantly. Under the combined action of the spring return force and the medium backflow pressure, the butterfly disc quickly closes 80% of the stroke, initially blocking the medium backflow.

3. Slow Closing Buffer Stage: The remaining 20% of the stroke is controlled by the hydraulic damping mechanism. The flow rate of hydraulic oil is controlled by adjusting the needle valve, so that the butterfly disc closes slowly, buffering the impact force of medium backflow, eliminating water hammer, avoiding noise during closing, and achieving complete sealing to prevent medium leakage.

V. Application Fields

Specially designed for pipeline systems that need anti-water hammer, noise reduction and backflow prevention, it is widely used in the following fields. The factory can customize the suitable model according to specific working conditions:

• Water Pump System: Water pump outlet pipelines, preventing pump stop water hammer from damaging water pumps and medium backflow, suitable for fire pumps, circulating water pumps, water supply pumps, etc.

• Municipal Water Affairs: Urban water supply pipe network, secondary water supply system, municipal drainage pipeline, sewage lifting pump station, ensuring the safe and stable operation of the pipe network.

• Sewage Treatment: Inlet and outlet pipelines of sewage treatment plants, sludge conveying pipelines, resistant to sewage corrosion, preventing medium backflow pollution.

• Building Water Supply and Drainage: Water supply pipelines and fire pipelines of high-rise buildings, commercial complexes and residential communities, reducing noise and adapting to residential living scenarios.

• Other Fields: Industrial cooling water systems, agricultural irrigation systems, seawater desalination pipelines, adapting to the transmission of various non-corrosive media.

VI. Installation & Maintenance Guide

Pre-Installation Preparation

1. Check whether the valve model, specification and pressure level meet the design requirements, confirm that the valve body is free of damage, the sealing surface is free of damage, and the qualification certificate provided by the factory is complete.

2. Remove debris and oil inside the valve, check whether the slow closing mechanism is flexible, the spring is free of deformation, and the seal is free of aging.

3. Check the pipeline flange sealing surface to ensure it is flat, free of scratches and debris, so as to avoid affecting the sealing performance after installation.

Installation Points

1. The valve must be installed horizontally on the pipeline, and the medium flow direction must be consistent with the arrow mark on the valve body. Reverse installation is strictly prohibited (otherwise, the check and anti-water hammer functions cannot be realized).

2. When flanged connection is adopted, the bolts should be tightened evenly and symmetrically with moderate force to avoid flange deformation leading to sealing leakage; reserve operation space during installation to facilitate later maintenance and slow closing time adjustment.

3. It is recommended to install expansion joints before and after the valve to absorb pipeline thermal expansion and contraction and protect the valve; install a filter before the valve to prevent debris from entering the slow closing mechanism and avoid jamming.

4. After installation, conduct strength test and sealing test. Confirm that there is no leakage and the slow closing action is normal before putting into use.

Maintenance

1. Regularly check the valve operation status, observe whether there is leakage or abnormal noise, and manually open and close 1~2 times a month to prevent butterfly disc jamming.

2. Check the seals every six months. If aging or damage is found, replace them in time; check the hydraulic oil of the slow closing mechanism, and supplement it in time when it is insufficient to ensure the normal slow closing function.

3. Keep the valve surface clean, regularly clean the dust and oil on the valve body surface to avoid corrosion; for valves that have been out of service for a long time, close the valves before and after, empty the internal medium, and take protective measures.

4. The factory provides lifelong technical support. If a fault occurs, you can contact the factory's professional team for on-site maintenance to avoid damaging the valve by disassembly.

VII. Product Advantage Summary

• More Efficient Anti-Water Hammer: Hydraulic damping slow closing design completely eliminates pump stop water hammer, protects water pumps and pipelines, and reduces potential safety hazards.

• Noise Reduction: Stable slow closing process, low operating noise, suitable for noise-sensitive scenarios, improving user experience.

• Low Resistance Energy Saving: Straight-through flow channel, small flow resistance, reducing water pump energy consumption, and saving a lot of operating costs in long-term use.

• Durable and Reliable: Ductile iron valve body + stainless steel internal parts + EPDM seal, corrosion and wear resistant, long service life and low failure rate.

• Factory Direct Supply: Source production, preferential price, customization on demand, perfect after-sales service, higher cost performance.

• Convenient and Worry-Free: Automatic operation, simple maintenance, easy installation, suitable for various working conditions, strong versatility.

With excellent anti-water hammer, noise reduction and energy saving performance, as well as the durability of ductile iron and the advantages of factory direct supply, HH48X Low Resistance Slow Closing Butterfly Check Valve has become the preferred check valve product in municipal water affairs, water pump systems, building water supply and drainage and other fields, effectively ensuring the safe, stable and efficient operation of pipeline systems.