Shanghai Jinhai Hydraulic Co.,Ltd
Shanghai Jinhai Hydraulic Co.,Ltd
Home> News> Working principle and function introduction of HED40A pressure relay
December 15, 2023

Working principle and function introduction of HED40A pressure relay

HED40A pressure relays are important components in a variety of industrial applications for monitoring and controlling pressure levels. This article will introduce the working principle and functions of the HED40A Pressure Relay, focusing on its key components and features.

The HED40A pressure relay consists of several components including a housing, plug with plunger, spring, regulating plate and switch. These components work together to accurately detect and respond to pressure changes in the system.

When pressure is applied to the plunger, it presses against the spring seat, overcoming the continuously changing force of the spring. The spring seat then transfers the movement of the plunger to the switch, which activates or deactivates the circuit as required by the design.

Hed40a Pressure RelayPressure Relay Hed40a


HED40A pressure relay functions:
1. Monitor and control pressure levels within the system. It can be set to trigger an alarm or shut down the system when pressure exceeds or falls below a predetermined threshold. This ensures overall operational safety and efficiency.

2. The HED40A pressure relay is also equipped with a mechanical stop device, which can protect the relay from damage caused by excessive pressure. This feature is critical to preventing costly repairs or system failure due to overpressure conditions.

3.HED40A pressure relay also provides adjustment flexibility. The adjustment plate allows the user to fine-tune the relay's response to pressure changes, ensuring accurate and reliable operation. This adjustability is especially important for systems that require precise pressure control for optimal performance.

Rugged construction and components such as plugs, springs and switches ensure reliable operation in demanding environments. Additionally, the addition of mechanical stops and adjustable settings enhances functionality and reliability.


HED40A pressure relay is a versatile and reliable device that can be used in a wide range of industrial applications. This article provides an overview of its working principles and capabilities, highlighting its key components and features. The HED40A pressure relay accurately monitors and regulates pressure levels, playing a key role in maintaining the safety and efficiency of various systems.

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