What are the disadvantages of swing check valves?

In industrial fluid transmission, municipal water supply, HVAC and thermal pipeline systems, Check Valves are essential one-way flow components. They ensure unidirectional medium flow, prevent backflow, and protect pumps, instruments and pipeline equipment from reverse flow damage. Among various check valve types, swing check valves are widely adopted thanks to their mature structure and excellent flow performance. This article introduces their working principles and features, and compares them with ball check valves, diaphragm check valves and lift check valves, to provide professional references for valve selection.1. Structure and Core Features of Swing Check ValvesA swing check valve mainly consists of valve body, hinged disc, valve seat and pin shaft. It opens and closes automatically by medium pressure difference without extra driving devices. When medium flows forward, fluid pressure pushes the hinged disc to swing open for smooth flow. Once backflow occurs, the disc closes tightly against the seat by its own weight and reverse pressure to cut off backward flow.With straight internal flow passages, swing check valves feature low local resistance, small pressure drop and mild fluid turbulence, which hardly affect pipeline delivery efficiency. They are suitable for normal-temperature, medium and low-pressure working conditions, and widely used in municipal water pipelines, sewage treatment systems and general industrial circulation pipelines. They can handle water, wastewater, oil and other common neutral media.

2. Introduction of Other Mainstream Check Valves Wafer Check Valve A Wafer Check Valve is a compact, slim-profile valve installed between two pipeline flanges, without the need for an independent valve body flange. It adopts a lightweight disc structure (usually swing or lift type) and relies on medium pressure difference for automatic opening and closing. It features small space occupation, light weight and easy installation, making it ideal for pipelines with limited installation space and frequent maintenance needs. It is widely used in municipal water supply, HVAC systems and light industrial pipelines, but is not suitable for high-pressure, high-temperature or large-diameter pipeline scenarios.

Lift Check ValveDesigned with vertically movable disc, lift check valves own high structural rigidity and outstanding pressure resistance, suitable for high-pressure and high-temperature working conditions such as boiler water supply and steam transmission pipelines. It supports both horizontal and vertical installation. Nevertheless, it has relatively large opening resistance and demands high cleanliness of conveyed media.

3. Comprehensive Performance Comparison

• Flow Capacity: Swing check valves have the minimum pressure drop and fit large-flow pipelines best; lift check valves rank second, while ball and diaphragm types are more suitable for medium and small flow scenarios.
• Pressure & Temperature Resistance: Lift check valves adapt to high pressure and high temperature; swing check valves fit common medium-low pressure environments; ball and Diaphragm Valves are limited to low-pressure normal-temperature occasions.
• Medium Adaptability: Swing check valves have spacious internal space, and can stably convey media containing suspended particles and slight sediments. Lift valves apply to clean industrial fluid; diaphragm valves suit sanitary anti-corrosion media; Ball Valves are only for pure media free of impurities.
• Installation Requirements: Swing check valves need extra space for disc swing, preferably installed horizontally; lift valves have no strict installation limits; ball and diaphragm valves are applicable to narrow pipeline spaces.
• Operation Defects: Swing check valves may cause water hammer and pipeline vibration under sharply fluctuating flow; lift valves are easy to get stuck by scale; diaphragm valves have short service life of wearing parts.
• Maintenance Cost: Swing check valves have simple structure, convenient inspection and low long-term maintenance cost; diaphragm valves need frequent part replacement with higher operating cost.

4. Practical Selection Rules

1. Choose swing check valves for large-diameter, large-flow pipelines to balance delivery efficiency and backflow prevention effect.
2. Adopt lift check valves for high-pressure and high-temperature industrial working conditions.
3. Select diaphragm check valves for hygienic production industries such as food and pharmacy.
4. Use compact ball check valves for small precision pipelines with narrow installation space.
5. Prioritize swing check valves for media mixed with impurities to prevent valve blockage.
6. Install slow-closing swing check valves in pipelines with unstable flow to reduce water hammer impact.

5. General Maintenance TipsRegularly clean internal dirt and check sealing surface abrasion and opening flexibility of all check valves. For swing check valves, focus on lubricating hinge parts to ensure flexible movement. Prepare spare diaphragms in advance for timely replacement. Conduct regular sealing tests on high-pressure lift check valves to avoid leakage.ConclusionCheck valve selection shall be determined according to actual pipeline flow rate, working pressure, medium property, temperature and installation conditions. Swing check valves stand out in general fluid systems for low pressure loss, smooth flow, strong impurity resistance and cost advantages. Meanwhile, lift, diaphragm and ball check valves play irreplaceable roles in high-pressure, sanitary and compact pipeline applications respectively. Proper valve matching can effectively prevent medium backflow, extend service life of pipeline equipment, and ensure safe, stable and energy-saving operation of the whole fluid system.

Media Contact
Company Name: Tianjin KEFA Valve Co., Ltd.
Email: Send Email
Country: China
Website: https://www.kefa-valves.com/