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Leak-Free Diaphragm Pump Manufacturer

Shanghai Haoyang Pump Valve Manufacturing Co., Ltd. Shanghai Haoyang Pump Valve Manufacturing Co., Ltd.
ABOUT US
Your Expert in Fluid Transportation
Shanghai Haoyang Pump Valve Manufacturing Co., Ltd. is a China Leak-Free Diaphragm Pump Manufacturer and Custom Leak-Free Diaphragm Pump Factory. Established in 2006, Shanghai Haoyang Pump Valve Manufacturing Co., Ltd. is a specialized enterprise dedicated to the development, design, manufacturing, sales, and service of diaphragm pumps. Our company boasts modern standard workshops and has introduced advanced automation equipment along with reliable processing technologies. Recognized as a "High and New Technology Enterprise" by the state in 2020, we have been granted multiple patents and all our products have received the European CE certification, in addition to passing the ISO 9001 quality management system certification.
Our HY series of air-operated diaphragm pumps, while retaining the advantages of similar products, have been meticulously refined, absorbed, and innovated upon. They are characterized by their environmental friendliness, energy efficiency, explosion-proof capabilities, versatility, high stability, and trouble-free operation.
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Shanghai Haoyang Pump Valve Manufacturing Co., Ltd. Shanghai Haoyang Pump Valve Manufacturing Co., Ltd.
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Certificate Of Honor
  • CE Certificate
  • ISO900
  • Utility Model Patent Certificate
  • Utility Model Patent Certificate
  • Utility Model Patent Certificate
  • Utility Model Patent Certificate
  • Utility Model Patent Certificate
NEWS CENTER
Latest News and Events Share With You
  • How Hydraulic Diaphragm Pump Works | Working Principle & Benefits

    A hydraulic diaphragm pump moves fluid by using hydraulic oil on one side of a flexible diaphragm to create suction and discharge strokes, completely isolating the pumped liquid from the drive end. This design eliminates dynamic seals and makes it possible to handle abrasive slurries, corrosive che...

    How Hydraulic Diaphragm Pump Works | Working Principle & Benefits
  • How Diaphragm Pump Adjusts Pressure Switch: Step-by-Step

    A diaphragm pump adjusts its pressure switch by changing the tension on an internal spring mechanism, which determines the cut-in and cut-out pressure thresholds. The pressure switch is a mechanical or electronic device that monitors the system pressure and controls the pump's motor to maintain a d...

    How Diaphragm Pump Adjusts Pressure Switch: Step-by-Step
  • How to Fix a Diaphragm Pump: Step-by-Step Guide

    To fix a diaphragm pump that has lost pressure, is leaking fluid, or has stopped pumping entirely, the most common repair procedure is to replace the worn or ruptured flexible diaphragm, clean or replace the check valves, and inspect the pump housing for cracks or debris. According to the Hydraulic...

    How to Fix a Diaphragm Pump: Step-by-Step Guide
Products Industry knowledge

Diaphragm pump is a positive-displacement fluid transfer device that uses flexible diaphragms and check valves to realize suction and discharge through reciprocating movement. As a core equipment for industrial fluid transportation, Diaphragm pump supports stable delivery of corrosive, high-viscosity, particle-containing and shear-sensitive media, with good sealing and dry-running capability. Shanghai Haoyang Pump Valve Manufacturing Co., Ltd. focuses on Diaphragm pump R&D and production since 2006, providing CE-certified, ISO9001-compliant Diaphragm pump solutions for global users.

Working Principle

Diaphragm pump forms alternating volume change via diaphragm reciprocation, generating pressure difference to drive fluid flow.

  • Suction stroke: Diaphragm moves outward, chamber volume increases, inlet valve opens, fluid enters
  • Discharge stroke: Diaphragm moves inward, chamber volume decreases, outlet valve opens, fluid discharges
  • Check valves maintain one-way flow; dual-diaphragm structure ensures continuous output

Shanghai Haoyang HY series air-operated diaphragm pump adopts optimized air valve structure, improving operation stability and service life.

Core Performance & Product Highlights

  • Seal-less & leak-proof: Diaphragm isolates fluid and drive system, suitable for hazardous media
  • Self-priming capability: No need for pre-filling, adapts to low-pressure suction conditions
  • Explosion-proof & safe: Air-driven version avoids electric sparks, usable in hazardous areas
  • Wide media adaptability: Transfers liquids, slurries, viscous fluids and particle-containing media
  • Energy-saving & stable: Low air consumption, steady flow, reduced downtime

All Diaphragm pump products of Shanghai Haoyang hold CE certification and comply with international industrial standards.

Typical Application Cases

  • Chemical industry: Acid, alkali, solvent and pigment delivery
  • Petrochemical: Oil sludge, waste liquid and flammable fluid transfer
  • Food & beverage: Syrup, jam, edible oil and cleaning agent pumping
  • Environmental protection: Wastewater, sludge and flocculant dosing
  • Coating & printing: Paint, ink and adhesive supply
  • Mining & metallurgy: Slurry, ore powder and wastewater treatment

Shanghai Haoyang Diaphragm pump provides long-term stable operation in the above scenarios.

Performance Comparison Table

Item Diaphragm Pump Centrifugal Pump Gear Pump
Media type Corrosive, viscous, particle-containing Clean low-viscosity liquid Medium-viscosity clean liquid
Sealing performance Leak-proof (no shaft seal) Risk of leakage Risk of leakage
Dry running Allowed Not allowed Not allowed
Explosion-proof Air-driven version is intrinsically safe Needs special design Needs special design
Maintenance cost Low, easy diaphragm replacement Medium, seal replacement High, gear wear
Shanghai Haoyang support Full series customization Limited Limited
Comparison of Diaphragm Pump with other common fluid transfer pumps

Maintenance Guide

1. Daily inspection

  • Check air pressure, pipeline connection and valve action
  • Observe flow stability and abnormal noise

2. Regular maintenance (recommended by Shanghai Haoyang)

  • Clean filter every 500 working hours
  • Inspect diaphragm and check valves every 1000 hours
  • Replace wearing parts according to media corrosion level

3. Long-term storage

  • Clean pump chamber and dry internal parts
  • Store in dry, ventilated environment

FAQ

1. What is the suitable air pressure range for air-operated diaphragm pump?

Recommended working pressure: 0.2–0.8 MPa. Excessive pressure shortens diaphragm life; insufficient pressure reduces flow. Shanghai Haoyang HY series supports stable operation within this range.

2. How to select diaphragm material?

  • NBR: Oil-based media
  • FKM: Strong corrosive chemicals
  • PTFE: High-corrosion, high-temperature media

Shanghai Haoyang provides material matching for Diaphragm pump.

3. Why does flow rate decrease?

Possible causes: clogged filter, worn diaphragm, damaged check valve, insufficient air pressure. Follow Shanghai Haoyang maintenance manual for troubleshooting.

4. Can diaphragm pump run dry?

Yes. Diaphragm pump allows dry running without damage, suitable for intermittent operation.

5. Do you provide custom Diaphragm pump?

Yes. Shanghai Haoyang supports material, interface, flow and pressure customization for global wholesale clients.