Sun has introduced a new family of combination valve cartridges that incorporate a relief and check function into a single cartridge. And since both functions exist in one, only one cavity is required. This provides for a simpler system with fewer mechanical connections to maintain. As with other Sun relief products, several mounting configurations will be available, including pump mounting.
These 40 lpm hybrid cartridges are available in two different styles: relief-before-check and relief-after-check.
Relief-before-check
The relief-before-check cartridge can be used to provide pump isolation and relief protection in single or multiple pump circuits. It is available in three configurations.
* Direct-acting (3-port)
The HRDA cartridge incorporates a direct-acting relief tee’d in before a check function. When the pressure at the inlet (port 2) reaches the relief valve setting, the valve starts to open to tank (port 3), throttling flow to limit the pressure rise. The check valve flow is from the inlet (port 2) to the system port (port 1). These valves are smooth and quiet, essentially zero leak, dirt tolerant, immune to silting and are very fast.
Figure 1. HRDA direct-acting cartridge
* Ventable, pilot operated, balanced piston (4-port)
The HVCA cartridge incorporates a ventable, pilot-operated, balanced piston relief tee’d in before a check function. When the pressure at the inlet (port 2) reaches the relief valve setting, the valve starts to open to tank (port 3), throttling flow to regulate the pressure. The check valve flow is from the inlet (port 2) to the system port (port 1). The valve includes a vent port (port 4) that connects between the main piston and pilot stage to provide for remote control or unloading by other pilot or 2-way valves. These valves are accurate, have low pressure rise vs. flow, are smooth, quiet, and are moderately fast.
Figure 2. HVCA ventable, pilot operated, balanced piston (4-port) cartridge
* Ventable, pilot operated, balanced piston relief main stage with integral T-8A control cavity
The HVCA-8 cartridge incorporates a normally closed, balanced piston modulating element tee’d in before a check function. The valve incorporates an integral pilot control cavity. The pilot control cavity will accept any T-8A pressure control cartridge. When the pressure at the inlet (port 2) reaches the pilot control valve setting, the modulating element starts to open to tank (port 3), throttling flow to regulate the pressure. The T-8A pilot section is drained to port 4. The check valve flow is from the inlet (port 2) to the system port (port1).
Figure 3. HVCA-8 ventable, pilot operated, balanced piston relief main stage with integral T-8A control cavity cartridge
This cartridge is designed to accept a pilot control valve into the T-8A cavity located in the hex end of the cartridge. An air-piloted relief or proportional pilot control valve is recommended for a wider range of control.
Relief-after-check
The relief-after-check cartridge provides protection on the system side of the circuit and is only available in direct-acting configuration.
Figure 4. HRDB relief-after-check cartridge
The HRDB cartridge incorporates a direct-acting relief tee’d in after a check function. The check valve flow is from the inlet (port 2) to the system port (port1). When the pressure in the system (port 1) reaches the relief valve setting, the valve starts to open to tank (port 3), throttling flow to limit the pressure rise. These valves are smooth and quiet, essentially zero-leak, dirt-tolerant, immune to silting and are very fast.
Read more...Hydraulic systems in heavy machinery
Hydraulic systems & components
In this article, we explore how hydraulic systems function, their role in powering heavy equipment, and why they are the preferred choice for industries requiring immense power and precision.
Read more...How manufacturers achieve zero-leakage demands in hydraulic cylinders
Hydraulic systems & components
Imagine a world where your hydraulic cylinders never leaked. The answer lies in a holistic approach that focuses on the fundamental components and their interactions, particularly the cylinder rod and its surrounding environment.
Read more...The seven different types of hydraulic fittings used for cylinders
Hydraulic systems & components
Hydraulic fittings are crucial for maintaining the integrity of hydraulic circuits, Selecting the right type of hydraulic fitting is not only essential for preventing leaks but also for ensuring minimal downtime and enhancing overall system efficiency.
Read more...Control without complexity Axiom Hydraulics
Electrical switching & drive systems & components
In an era where precision, performance and smart control define industrial success, the right driver can make all the difference. At Axiom Hydraulics, we’ve seen firsthand how the Sun Hydraulics XMD series transforms hydraulic systems, from mining and construction to agriculture and automation.
Read more...The seven different types of hydraulic fittings used for cylinders
Hydraulic systems & components
Hydraulic fittings are crucial for maintaining the integrity of hydraulic circuits, Selecting the right type of hydraulic fitting is not only essential for preventing leaks but also for ensuring minimal downtime and enhancing overall system efficiency.
Read more...Powering southern Africa’s industrial evolution for over five decades
Editor's Choice Hydraulic systems & components
Established in 1974, Oilpower is a recognised name in South Africa’s hydraulic and pneumatic sector. What started as a small, family-run business has matured into a highly structured operation with specialised teams, experienced engineers and a reputation for technical excellence and reliability. Oilpower is celebrating its 50th anniversary this year.
Read more...Choosing the right hydraulic cylinder for your application CT Hydraulics (Nqoba)
Hydraulic systems & components
Selecting the appropriate hydraulic cylinder for your specific application involves considering several key factors to ensure optimal performance, efficiency and durability. Here’s a comprehensive guide to help you make an informed decision.
Read more...Hydroformed tube valve body for diaphragm valves
Hydraulic systems & components
One of the most common necessities for manufacturing pharmaceuticals, cosmetics, food and beverages are diaphragm valves. What used to be a dull two-way race between forged and cast body variants is now being challenged by an exciting, ground-breaking technology. The hydroformed, light-weight diaphragm tube valve body will change the way you think about plant design and operation.
While every effort has been made to ensure the accuracy of the information contained herein, the publisher and its agents cannot be held responsible for any errors contained, or any loss incurred as a result. Articles published do not necessarily reflect the views of the publishers. The editor reserves the right to alter or cut copy. Articles submitted are deemed to have been cleared for publication. Advertisements and company contact details are published as provided by the advertiser. Technews Publishing (Pty) Ltd cannot be held responsible for the accuracy or veracity of supplied material.
printer friendly version