搜索历史清除全部记录
- All
- Product Management
- News
- Introduction
- Enterprise outlets
- FAQ
- Enterprise Video
- Enterprise Atlas
Specification for Setting and Operational Guidelines of the Safety Valve in the Hydraulic System of a Wet Spraying Boom
Release time:
2026-03-24
Source:
Author:
Summary:
In the hydraulic system of a wet-spraying boom, the safety valve—typically the main relief valve—serves as a critical “pressure barrier.” Its primary function is to set the maximum allowable working pressure of the hydraulic system; when system pressure attempts to exceed this preset value due to excessive load or abnormal conditions, the valve automatically opens to relieve pressure, thereby protecting all components—including the hydraulic pump, valve manifold, actuators, and piping—from damage caused by overpressure. Properly setting the safety valve is a fundamental and indispensable maintenance task that ensures safe equipment operation, prevents catastrophic failures, and extends service life.
The set pressure of a safety valve is not a value that can be adjusted at will; rather, it is determined by the equipment manufacturer through rigorous calculations and testing, taking into account the design strength of all hydraulic components, the pressure rating of the seals, and the dynamic characteristics of the system. The specified set pressure is typically clearly stated in the equipment’s technical manual, and any adjustments must be made in accordance with this specification.
The core principle for setting a safety valve is to establish the set pressure as close as possible to, yet not exceeding, the maximum allowable working pressure of the system components—while still providing adequate protection. A valve set too low will cause frequent overpressure relief, preventing the equipment from performing as designed; this manifests as sluggish or weak actuator response and excessive heat generation due to continuous high-pressure fluid overflow, leading to system overheating. Conversely, a valve set too high loses its protective function, exposing hydraulic components to prolonged overload conditions and increasing the risk of catastrophic failures such as seal rupture, pipeline bursts, and pump damage.
The setting of safety valves must adhere to rigorous preparatory work and operational procedures:
1. Preparations:
Equipment Status: Ensure the equipment is parked on a level surface, the engine is turned off, and all hydraulic actuators (such as the boom and pumping cylinders) have been reliably depressurized and securely locked in place.
Tools and instruments: Prepare a calibrated instrument with a sufficiently high accuracy class (typically with an error of less than 1% ) precision pressure gauge, whose range shall cover the system’s rated pressure of 1.5 To 2 times. At the same time, appropriate tools such as wrenches and screwdrivers are required.
Technical Documentation: Prepare the equipment’s user manual or hydraulic schematic diagram, and clearly verify the installation location of the main safety valve as well as its standard set pressure.
2. Standard setup procedure:
Connecting the pressure gauge: Attach the precision pressure gauge to the main pump outlet or to the pressure-tapping point closest to the safety valve, ensuring a secure connection with no leaks.
Location and Preparation: Locate the main safety valve and identify its pressure adjustment mechanism (typically a locknut and adjusting screw).
Simulated Loading and Adjustment: Start the engine and allow it to run at its rated speed. Select an operation that can stably load the system pressure (for example, pressurizing the pumping system or extending the boom cylinder to its mechanical limit). Important note: During pressurization, each hold should not exceed 10 seconds to prevent a rapid rise in oil temperature.
During the pressurization process, slowly rotate the adjustment screw clockwise to gradually increase system pressure. Closely monitor the pressure gauge reading, and immediately stop rotating the screw when the pressure reaches the standard setpoint specified in the technical manual.
Locking and Verification: While ensuring that the adjusting screw remains completely stationary, securely tighten its lock nut. After tightening, apply a brief additional load to verify whether the pressure gauge reading has shifted as a result of the locking operation. If a shift is observed, loosen the lock nut and make fine adjustments until, following tightening, the pressure value remains accurately and stably at the specified standard value.
Final Inspection: After completion of the setup, remove all loads, resume normal operation, and re-inspect all connections for leaks.
Safety precautions are the absolute prerequisite for performing any task:
Operators must undergo specialized training and have a thorough understanding of hydraulic principles and associated risks.
The work site must be kept clean and tidy, and unauthorized personnel must stay away.
It is strictly prohibited to perform any disassembly or adjustment while the pressure has not been completely relieved.
When dealing with the risk of high-pressure oil leaks, always wear safety goggles and gloves.
It is strictly prohibited to arbitrarily increase the set pressure of safety valves in order to make the equipment “more powerful.” This is an extremely dangerous practice that can damage the equipment.
Conclusion
The proper setting of the safety valve in the hydraulic system of a wet-spraying boom is a technically demanding task that requires precision, rigor, and strict adherence to established procedures. It relies on standardized technical documentation, high-precision measuring instruments, and skilled operational expertise. Accurately adjusting the safety valve pressure within the manufacturer’s specified range establishes a reliable safety barrier for the entire hydraulic system. This safeguard not only ensures that the equipment performs as designed but also effectively prevents component damage and safety incidents caused by overpressure, serving as the cornerstone for safe, efficient, and long-term stable operation. Each compliant adjustment represents a critical investment in both equipment assets and construction safety.
RELATED INFORMATION
Contact Us
Changsha Base:Hunan Zenxon Heavy Industry Technology Co., Ltd.
Address: Jinrong Tongxin International Industrial Park, Changsha High-tech Zone
Loudi Base:Hunan Haoda Heavy Industry Technology Co., Ltd.
Address: Loudi Avenue, Loudi High-tech Industrial Development Zone, Lianyuan City, Loudi City, Hunan Province
Telephone:400-186-0868
E-mail:3804246750@qq.com
E-mail:19967177733@163.com
0
Consult now
WeChat Public Number
TikTok