The valve utilized line pressure for controlling the other hydraulic parts acting in sequence and to realize automatic controlled in hydraulic system. It can act as an unloader or a back pressure valve.
Symbol of diagram
Mineral hydraulic oil DIN51524 51525
Temperature range of medium
-20 to +80°C
Viscosity range of medium
Working pressure of A,B,X ports
Up to 31.5Mpa
Back pressure of Y port
Up to 31.5Mpa
Adjusting cut pressure
0.3Mpa up to 21Mpa (relate to flow )
up to 150L/min
up to 300L/min
up to 450L/min
The high contaminate class of oil is the ninth class of NAS 1638, recommend to use the oil filter with minimal filter fineness β10≥75
Principle of operation
Type DZ pilot-operated sequence valve is used for sequence acting with pressure controlling in hydraulic system.Type DZ valve is combined a pilot valve, main valve with insert spool and a check valve whick can be elective.According to circumstances for controlling oil of supply and drain, be composed different type( See symbol of diagram ).
The pressure oil of A port flows through passage(2) into dumper(1)which on the pilot valve of the controlling piston. At the same time, the pressure oil also flows past dumper(5)which acting on the main spool(6)of the top cavity. When the pressure of A cavity exceeds the rated valve of the spring(7), the controlling piston will move to the spring(7)the oil of main spool (6)top cavity flows through(8). Controlled side 14 and passage(9)into B cavity. The differential pressure is caused on the main spool(6)and it is opened by the pressure. The A cavity and B cavity are connected with oil and the opening pressure is constant by the spring(7)force. The leakage oil of the controlling piston will flow to B cavity with inner passage(10). If the oil flows from B cavity to A cavity, please elect the structure with inner check valve.
The principle of operation is the same for the type DZ…-30/21. Only the input mode of controlling oil is different. The controlling oil of type DZ…-30/21X flows through passage(2)from outside.
The principle of operation is the same for DZ…-30/21. Only the drain mode of the controlling piston with leakage is different. The leakage oil of the controlling piston for the type DZ…-30/21Y must exhaust from passage(10)or (11) to reservoir under no back pressure condition. The controlling oil goes through passage(9)to B cavity.
The pressure oil of X cavity goes through passage(2),damper(1)which acting on the controlling piston(3)of the pilot valve(4). At the same time, the pressure of A cavity goes through the damper(5)which acting on the top cavity of the main spool(6). When the pressure of X cavity exceeds the rated valve of the spring(7), the controlling piston will move to the spring(7). Because of the piston(3)moving, the oil of top cavity main spool through(8)and hole(15)to the spring cavity(12)of the pilot valve(4). Thus the pressure oil flows from A cavity to B cavity under hardly any pressure loss condition. In order to attain the goal of unloading. The oil of the spring cavity(12)exhausts from passage(10)or(11)to reservoir under no back pressure condition.
If the pressure oil flows from B to A, please elect the structure with a check valve. Structure with check valve Structure without check valve.
These curve are available to control oil with no back pressure for outer return conditions.
External and connecting dimensions
1.Adjusting scale cover 2.Adjusting mode 1 3.Adjusting mode 2 4.Adjusting mode 3 5.Position pin 6.Connection port Y1 ( as back pressure valve and sequence valve puter drain port for controlling oil ) 7.Name plate 8.Connection port Y ( as unloader and sequence valve spring cavity outer drain port for controlling oil )
O-ring X,Y cavity
O-ring A,B cavity
Note: The pilot valve of outer draining thread is ordinary for G1/4, if the customer wants thread for M14X1.5, please explain when ordering.
Packaging & Shipping
How are orders packed and shipped?
Depends on customers' orders. All goods are packed with a plastic bag with an outer carton and a wooden pallet( fumigation).
Can be customized according to customer requirements
We provide hydraulic, lubrication, pneumatic technology consulting, system design,and the parts.
Could Raypoo offer OEM service?
Yes. Raypo is able to offer OEM with customers' brand name and trademark onto the product.
Do Raypoo products come with a warranty?
Yes.Raypoo offer 1-year guarantee without abusive usage on all purchases which begins with the bill of lading.
Shenzhen raypoo is a manufacturer of hydraulic products and engineered solutions serving the fluid power market.
The Company offers an engineering and manufacturing team capable of providing advanced technology in the design and production of unique fluid power components and electronic controls.
The Company's involvement focuses its expertise on markets in which customers demand top quality, prompt delivery, high performance and responsive aftermarket support.
The Company's products include hydraulic pumps, hydraulic motors, hydraulic valve ,valves controls manifolds, ,hydraulic cylinders, Industries that use these products include primary metals, machine tool, automobile, petroleum, construction equipment, chemical, plastic, glass, lumber, rubber and food.
The Company strives to serve those markets requiring high technology and expertise where reliability, top performance and longer service life are needed.
The products are sold as individual components or integrated into high performanceapplications.
Plant and equipment Photos :
Q.How to request a manufacturing quotation from Raypoo?
A.Give us a call or send us an E-mail with your purchase request.
Q.What are your quality control procedures?
A.Raypoo is equippedwith high-tech, advancedcomputerized and self-inspection machineries, manufactures thousands of different parts in house to ensure the built-in quality and dependable performance. This is the reason why Raypoo is recognized as on the world class quality level.