WEH Series Directional Hydraulic Valves Of Pilot Operated
The WEH series directional hydraulic valves of pilot operated are advanced components that provide precise and efficient control over hydraulic systems. Designed to meet the demands of various industries, these valves offer exceptional performance, reliability, and versatility.
The WEH series directional hydraulic valves of pilot operated are reliable, high-performance components that empower operators with precise control and efficient fluid management in hydraulic systems. With their pilot-operated design, exceptional directional control, a wide range of configurations, and high flow capacity, these valves offer the reliability and versatility required in various industries. Following the recommended usage methods and adhering to regular maintenance practices, the WEH series valves will continue delivering exceptional performance. Upgrade your hydraulic system with the WEH series directional hydraulic valves operated and experience the benefits of precision, control, and reliability.
WEH Series Directional Hydraulic Valves Of Pilot Operated Key Characteristics:
- Pilot Operated Design:
- The WEH series valves utilize a pilot-operated design, which enhances their responsiveness and control accuracy.
- This design enables the valves to handle high-pressure applications, ensuring optimal performance easily.
- Directional Control:
- These hydraulic valves excel in providing precise directional control of hydraulic fluid.
- Operators can easily manage fluid flow and direct it to different actuators or components within the hydraulic system.
- Wide Range of Configurations:
- The WEH series valves are available in various configurations, including various sizes, flow rates, and pressure ratings.
- This versatility allows them to be tailored to specific application requirements and system specifications.
- High Flow Capacity:
- These valves are designed to handle high flow rates, making them suitable for applications that demand substantial fluid flow.
- Their optimized internal passages and robust construction ensure minimal pressure drop and efficient fluid management.
WEH Series Directional Hydraulic Valves Of Pilot Operated Parameter:
NG10
| Specifications | WEH10 type | |||||||||
| Max. operating pressure：P、A、B | 350 | |||||||||
| Port T | With external pilot oil drain bar | 315 | ||||||||
| With internal pilot oil drain bar | DC 210 AC 160 | |||||||||
| Port Y | With external pilot oil drain bar | DC 210 AC 160 | ||||||||
| Min. control pressure | With external pilot oil supply ( not apply to C、Z、 F、G、H、P、T、V) bar |
3-position valve 10 | ||||||||
| Spring-return 2-position valve 10 | ||||||||||
| Hydraulic-return 2-position valve 7 | ||||||||||
| With internal pilot oil supply ( apply to C、Z、F、 G、H、P、T、V) bar |
6.5 | |||||||||
| Max. control pressure bar | 250 | |||||||||
| Fluid | Mineral oil,Phosphate ester | |||||||||
| Fluid temperature range ℃ | -30 to +80 ( NBR seals | |||||||||
| -20 to +80 ( FKM seals ) | ||||||||||
| Viscosity range mm2/s | 2.8 to 500 | |||||||||
| Switching pilot oil volume cm3 | 3-position valve 2.04 | |||||||||
| 2-position valve 4.08 | ||||||||||
| Switching times (= Valve switching time from the neutral position to the switched position)（AC and DC ） | ||||||||||
| Control pressure bar | 70 | 140 | 210 | 250 | ||||||
| AC | DC | AC | DC | AC | DC | AC | DC | |||
| 3-position valve ms | 30 | 65 | 25 | 60 | 20 | 55 | 15 | 50 | ||
| 2-position valve ms | 35 | 80 | 30 | 75 | 25 | 70 | 20 | 65 | ||
| Switching times (= Valve switching time from the switched position to the neutral position) | ||||||||||
| 3-position valve ms | 30 | |||||||||
| 2-position valve ms | 35 | 40 | 30 | 35 | 25 | 30 | 20 | 25 | ||
| Installation position | HC、HD、HK、HZ、HY Type hydraulic-return valves are installed horizontally, the rest can be installed arbitrarily | |||||||||
| Flow of shortest switching time L/min | about 35 | |||||||||
| Weight | Single solenoid valve kg | 6.7 | ||||||||
| Double solenoid valve kg | 7.1 | |||||||||
| Switching time regulator kg | 1.0 | |||||||||
| Reducing valve kg | 0.5 | |||||||||
NG16
| Specifications | WEH16… type | |||||||||||||
| Max. operating pressure：P、A、B | 350 | |||||||||||||
| Port T | With external pilot oil drain bar | 250 | ||||||||||||
| With internal pilot oil drain bar | DC 210 AC 160 | |||||||||||||
| Port Y | With external pilot oil drain bar | DC 210 AC 160 | ||||||||||||
| Min. control pressure | With external pilot oil supply ( not apply to C、Z、 F、G、H、P、T、V)bar |
3-position valve 14 | ||||||||||||
| Spring-return 2-position valve 14 | ||||||||||||||
| Hydraulic-return 2-position valve 14 | ||||||||||||||
| With internal pilot oil supply ( apply to C、Z、F、 G、 H、P、T、V) bar |
When applying prepressing or the flow is large correspondingly ,enginery of spool valve is 4.5 as C,Z,F,G,H,P,T and V | |||||||||||||
| Max. control pressure bar | 250 | |||||||||||||
| Fluid | Mineral oil,Phosphate ester | |||||||||||||
| Fluid temperature range ℃ | -30 to +80 ( NBR seals | |||||||||||||
| -20 to +80 ( FKM seals ) | ||||||||||||||
| Viscosity range mm2/s | 2.8 to 500 | |||||||||||||
| Switching pilot oil volume | ||||||||||||||
| – Spring-centering 3-position valve cm3 | 5.72 | |||||||||||||
| – 2-position valve cm3 | 11.45 | |||||||||||||
| * * Switching times (= Valve switching time from the neutral position to the switched position)(AC and DC) | ||||||||||||||
| Control pressure bar | 50 | 150 | 250 | |||||||||||
| AC | DC | AC | DC | AC | DC | AC | DC | AC | DC | AC | DC | |||
| – Spring-centering 3-position valve ms | 35 | 65 | 30 | 60 | 30 | 58 | ||||||||
| – 2-position valve ms | 45 | 65 | 35 | 55 | 30 | 50 | ||||||||
| **Switching times (= Valve switching time from the neutral position to the switched position) | ||||||||||||||
| – Spring-centering 3-position valve ms | 30 | |||||||||||||
| – 2-position valve ms | 45 | 45 | 35 | 35 | 30 | 30 | ||||||||
| Installation position | C,D,K,Z,Y Type hydraulic-return valves are installed horizontally, the rest can be installed arbitrarily | |||||||||||||
| Flow of shortest switching time L/min | about 35 | |||||||||||||
| Weight kg | about 9.5 | |||||||||||||
NG25
| Specifications | WEH25… type | |||||||||||||||||
| Max. operating pressure：P、A、B | 350 | |||||||||||||||||
| Port T | With external pilot oil drain bar | 250 | ||||||||||||||||
| With internal pilot oil drain bar | DC 210 AC 160 | |||||||||||||||||
| Port Y | With external pilot oil drain bar | DC 210 AC 160 | ||||||||||||||||
| Min. control pressure | With external pilot oil supply ( not apply to C、Z、F、 G、H、P、T、V) bar |
Spring-centering 3-position valve 13 | ||||||||||||||||
| Spring-return 2-position valve 13 | ||||||||||||||||||
| Hydraulic-return 2-position valve 8 | ||||||||||||||||||
| With internal pilot oil supply ( apply to C、Z、F、 G、H、P、T、V) bar |
When applying prepressing or the flow is large correspondingly ,enginery of spool valve is 4.5 as C,Z,F,G,H,P,T and V | |||||||||||||||||
| Max. control pressure bar | 250 | |||||||||||||||||
| Fluid | Mineral oil,Phosphate ester | |||||||||||||||||
| Fluid temperature range ℃ | -30 to +80 ( NBR seals | |||||||||||||||||
| -20 to +80 ( FKM seals ) | ||||||||||||||||||
| Switching pilot oil volume | ||||||||||||||||||
| – Spring-centering 3-position valve cm3 | 14.2 | |||||||||||||||||
| – 2-position valve cm3 | 28.4 | |||||||||||||||||
| * Switching times (= Valve switching time from the neutral position to the switched position)(AC and DC) | ||||||||||||||||||
| Control pressure bar | 50 | 140 | 210 | 250 | ||||||||||||||
| AC | DC | AC | DC | AC | DC | AC | DC | |||||||||||
| – Spring-centering 3-position valve ms | 50 | 85 | 40 | 75 | 35 | 70 | 30 | 65 | ||||||||||
| – 2-position valve ms | 120 | 160 | 100 | 130 | 85 | 120 | 70 | 105 | ||||||||||
| *Switching times (= Valve switching time from the neutral position to the switched position) | ||||||||||||||||||
| – Spring-centering 3-position valve ms | 40 | |||||||||||||||||
| – 2-position valve ms | 120 | 125 | 95 | 100 | 85 | 90 | 75 | 80 | ||||||||||
| Installation position | C,D,K,Z,Y Type hydraulic-return valves are installed horizontally, the rest can be installed arbitrarily | |||||||||||||||||
| Flow of shortest switching time L/min | about 35 | |||||||||||||||||
| Weight kg | about 18 | |||||||||||||||||
NG32
| Specifications | WEH32… type | |||||||||||||
| Max. operating pressure：P、A、B | 350 | |||||||||||||
| Port T | With external pilot oil drain bar | 250 | ||||||||||||
| With internal pilot oil drain bar | DC 210 AC 160 | |||||||||||||
| Port Y | With external pilot oil drain bar | DC 210 AC 160 | ||||||||||||
| Min. control pressure | With external pilot oil supply
With internal pilot oil supply |
3-position valve 8.5 | ||||||||||||
| Spring-return 2-position valve 10 | ||||||||||||||
| Hydraulic-return 2-position valve 15 | ||||||||||||||
| With internal pilot oil supply ( apply to C、Z、F、 G、H、P、T、V) bar |
When applying prepressing or the flow is large correspondingly ,enginery of spool valve is 4.5 as C,Z,F,G,H,P,T and V | |||||||||||||
| Max. control pressure bar | 250 | |||||||||||||
| Fluid | Mineral oil,Phosphate ester | |||||||||||||
| Fluid temperature range ℃ | -30 to +80 ( NBR seals | |||||||||||||
| -20 to +80 ( FKM seals ) | ||||||||||||||
| Viscosity range mm2/s | 2.8 to 500 | |||||||||||||
| Switching pilot oil volume | ||||||||||||||
| – Spring-centering 3-position valve cm3 | 29.4 | |||||||||||||
| – 2-position valve cm3 | 58.8 | |||||||||||||
| * Switching times (= Valve switching time from the neutral position to the switched position)(AC and DC) | ||||||||||||||
| Control pressure bar | 50 | 150 | 250 | |||||||||||
| AC | DC | AC | DC | AC | DC | |||||||||
| – Spring-centering 3-position valve ms | 65 | 80 | 50 | 90 | 35 | 105 | ||||||||
| – 2-position valve ms | 100 | 130 | 75 | 100 | 60 | 115 | ||||||||
| *Switching times (= Valve switching time from the neutral position to the switched position) | ||||||||||||||
| – Spring-centering 3-position valve ms | ( DC ：50，AC ：60) | |||||||||||||
| – 2-position valve ms | 115 | 90 | 35 | 70 | 65 | 65 | ||||||||
| Installation position | C、D、K、Z、YType hydraulic-return valves are installed horizontally, the rest can be installed arbitrarily | |||||||||||||
| Flow of shortest switching time L/min | about 50 | |||||||||||||
| Weight kg | about 36 | |||||||||||||
WEH Series Directional Hydraulic Valves Of Pilot Operated Advantages:
• Electrohydraulic directioanl valve directioanls the oil path by controlling the main spool
• WEH electrohydraulic control
• Installation face follow DIN 24340 A, ISO 4401 and CETOP-RP 121H Sub-plate mounting connection
• Wet DC or AC solenoid (optional)
• With manual emergency control
• Electropneumatic connection as single or center connection
• Spring or hydraulic alignment or bias
Usage Method Of WEH Series Directional Hydraulic Valves Of Pilot Operated:
- System Integration:
- Identify the optimal location for installing the WEH series valves within the hydraulic system, considering the desired flow path and control requirements.
- Ensure compatibility with the system’s pressure and flow specifications.
- Mount the valves securely using appropriate brackets or mounting accessories.
- Pilot Control Setup:
- Connect the pilot control lines to the designated ports on the valves, following the manufacturer’s instructions.
- Ensure proper sizing and routing of the pilot lines to maintain optimal control signal integrity.
- Fluid Connections:
- Select compatible hydraulic fittings and hoses for secure and leak-free connections.
- Follow the manufacturer’s instructions for proper torque values during the installation process.
- Use appropriate thread sealants or tape to ensure reliable seals.
- Control and Adjustment:
- To operate the WEH series valves, utilize the recommended control method, such as manual levers or electrical controls.
- Adjust the valves’ settings to achieve the desired flow direction and rates, ensuring optimal performance.
How Do Hydraulic Valve Lifters Work?
Hydraulic valve lifters, also known as hydraulic tappets or hydraulic lash adjusters, play a vital role in the proper operation of an internal combustion engine. They are responsible for maintaining the proper clearance, or “lash,” between the engine’s camshaft and valve train components. Here’s an overview of how hydraulic valve lifters work:
- Structure:
- Hydraulic valve lifters are small cylindrical devices typically made of metal.
- They are between the camshaft and the engine’s valve train components, such as the pushrods, rocker arms, or overhead cam followers.
- Hydraulic Operation:
- Inside the hydraulic valve lifter, a small piston mechanism operates based on hydraulic pressure.
- The lifter is filled with hydraulic fluid, typically engine oil, which acts as a working fluid.
- Camshaft Interaction:
- The camshaft has lobes or eccentric shapes that push against the lifters as it rotates.
- As the camshaft lobe comes into contact with the lifter, it applies a force that compresses its internal piston.
- Lash Adjustment:
- When the lifter’s piston is compressed, it pushes the hydraulic fluid out of the lifter through a small orifice.
- This hydraulic fluid is expelled into the engine’s oil galleries or passages.
- Lash Compensation:
- The expelled hydraulic fluid creates a hydraulic cushion or “spring” effect, compensating for any clearance or lash between the camshaft lobe and the valve train components.
- This compensation eliminates excessive clearance and ensures that the valve train remains in constant contact with the camshaft lobes.
- Maintenance of Lash:
- If there is excessive clearance or lash in the valve train due to wear or other factors, the lifter’s internal piston will extend further to maintain the necessary hydraulic pressure.
- This extended position allows the lifter to take up the additional clearance, thus maintaining proper valve lash.
- Oil Pressure and Lubrication:
- The hydraulic valve lifters rely on the engine’s oil pressure for proper operation.
- The oil pump circulates oil through the engine, and the lifters receive a continuous oil supply to maintain hydraulic pressure and lubrication.
Capability & Capacity Of Factory:
(1) Assembly
We have a first-class independent research and development assembly platform. The hydraulic cylinder production workshop has four semi-automatic lifting cylinder assembly lines and one automatic tilt cylinder assembly line, with a designed annual production capacity of 1 million pieces. The special cylinder workshop is equipped with various specifications of a semi-automatic cleaning assembly system with a designed annual production capacity of 200,000 and equipped with famous CNC machining equipment, a machining center, a high-precision cylinder processing special equipment, a robot welding machine, an automatic cleaning machine, automatic cylinder assembly machine, and automatic painting production line. Existing critical equipment of more than 300 sets (sets). The optimal allocation and efficient use of equipment resources ensure the accuracy requirements of products and meet the high-quality needs of products.
(2) Machining
The machining shop is equipped with a customized inclined rail turning center, machining center, high-speed honing machine, welding robot, and other related equipment, which can handle the processing of cylinder tubes with a maximum inner diameter of 400mm and a maximum length of 6 meters.
(3) Welding
(4) Painting & coating
With small and medium-sized cylinder automatic water-based paint coating lines, to achieve automatic robot loading and unloading and automatic spraying, the design capacity of 4000 pieces per shift;
We also have a semi-automatic paint production line for large cylinders powered by a power chain, with 60 cases per shift design capacity.
(5) Testing
We have first-class inspection facilities and test beds to ensure that the performance of the cylinder meets the requirements.
We are one of the best hydraulic cylinder manufacturers. We can offer comprehensive hydraulic cylinders. We also provide corresponding agricultural gearboxes. We have exported our products to clients worldwide and earned a good reputation because of our superior product quality and after-sales service. We welcome customers at home and abroad to contact us to negotiate business, exchange information, and cooperate with us!