E320/E330/E320B/E330B Rotary Relief Valve
4 week ago
Product details
E320/E330/E320B/E330B Rotary Relief Valve
1. Product Overview
Rotary Relief Valve (also known as swing relief valve) is a cartridge pressure safety component installed on the swing motor of Caterpillar E320, E330, E320B, E330B medium & large crawler excavators.
It independently limits the maximum working pressure of left and right swing hydraulic circuits. When slewing starts, stops or hits obstacles, instant pressure surges will open the relief valve to release excess pressure oil. It provides buffer and shock absorption, protects swing motor, swing gearbox, pipelines and structural parts from impact overload damage. Equipped with integrated makeup check valve to prevent motor internal cavitation. High-quality interchange spare part can directly replace OEM component for machine maintenance and overhaul.
E320/E330/E320B/E330B Swing Relief Valve is a dedicated pressure control Hydraulic valve. It belongs to core Excavator Spare Parts specially matched for CAT E320, E330, E320B and E330B excavators, serving as an important safety protection component for the excavator swing circuit of the hydraulic system. This Hydraulic valve limits peak pressure inside the swing motor loop, buffers impact pressure during swing startup and braking, and effectively prevents pressure overload failures. As essential Excavator Spare Parts, it maintains stable swing action and ensures safe and reliable operation of the whole excavator hydraulic system.
OEM Part Number: 154-0401, 173-3452
Compatible Models: CAT E320, E320B, E320BL, E330, E330B, E330BL
2. Main Technical Parameters
Item Specification
Valve Type Cartridge Swing Relief Valve with Built-in Makeup Check Valve
Standard Factory Setting Pressure 27.5 ~ 29.4 MPa
Adjustable Pressure Range 25.0 ~ 31.0 MPa
Applicable Medium ISO VG46 anti-wear hydraulic oil
Operating Temperature -20℃ ~ +90℃
Sealing Material NBR; FKM high-temperature sealing optional
Body Material Alloy steel, quenching & tempering, precision grinding
Mounting Position Swing motor end cover
Approximate Weight 0.21 kg
3. Working Principle
Under normal swing operation, spring presses the spool against valve seat, and overflow channel stays closed.
When the swing platform rotates and encounters resistance or sudden braking, hydraulic pressure inside swing circuit exceeds preset value. Hydraulic force overcomes spring force to lift the spool, high-pressure oil overflows to low-pressure chamber of swing motor to absorb impact.
When pressure falls below setting value, spring resets the spool and closes overflow passage. The built-in makeup check valve supplements hydraulic oil to prevent vacuum cavitation inside swing motor, avoiding wear caused by lack of lubrication.
4. Core Advantages
1. Specially matched for Caterpillar E320/E330/E320B/E330B; thread dimension, installation length and pressure characteristic fully consistent with original valve, plug-and-play direct replacement without modification.
2. Precisely lapped spool and valve seat assembly, low internal leakage, stable pressure holding under frequent start-stop slewing conditions.
3. Integral makeup check valve structure, effectively eliminate swing motor cavitation risk, extend swing motor service life.
4. Smooth pressure response, excellent buffer performance, reduce slewing impact and machine shaking during startup and stopping.
5. Adjustable pressure via tail nut, convenient on-site debugging to match different working conditions.
6. Wear-resistant alloy steel valve body, resist frequent pressure shock, suitable for mining, earthmoving and heavy construction projects.
5. Application Range
Safety buffer component for swing hydraulic circuit of Caterpillar E320, E330, E320B, E330B excavators.
Widely used in quarry mining, heavy earthmoving, road construction, stockyard loading and large infrastructure engineering.
6. Common Faults & Replacement Suggestion
Typical faults caused by defective swing relief valve: Insufficient swing power, one-way weak slewing, severe swing impact when starting/stopping, swing runaway after releasing joystick, abnormal hydraulic noise.
Similar Video Recommendation
<
>
Bossgoovideo.com Contact Now
If you are interested in the product, contact Bossgoovideo.com for more information
- *To:
- Ningbo Hengnuo Hydraulic Drive Co.,Ltd
- *Message:
-
Submit
Disclaimer :
The information of Bossgoovideo.com limited shown above is provided by the user or collected on the network. Video 2B does not guarantee the authenticity,accuracy and legitimacy of Bossgoovideo.com limited information. Video 2B does not involve legal relationships and disputes between users arising from
transactions other than secured transactions on this website. Disputes shall be settled by you through negotiation.
If you are the person in charge or relevant employee of this enterprise, if you find that the enterprise information is incorrect or want to manage thiscompany, please contact us jacklee1558@gmail.com, after you claim the enterprise, you can obtain management permission, publish supplyand demand information, bring consulting orders, and remove page advertisements.
Suppliers
Ningbo Hengnuo Hydraulic Drive Co.,Ltd
Audited supplier
4 year
Main Product:
hydraulic motor,
gear box ,
hydraulic pump,
hydraulic valve ,
hydraulic winch,
hydraulic system