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P40
cissoko
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The P40 Monoblock Directional Control Valve is an exceptionally popular, highly versatile hydraulic spool control valve. It is widely recognized as the global industry benchmark for compact mobile machinery, agricultural equipment, and small industrial systems requiring reliable flow control of up to 40 Liters per minute (approx. 11 GPM).
Built-In Safety Relief Valve: Every P40 valve features a standard, fully adjustable internal main pressure relief valve (typically adjustable from 50 bar up to 250 bar) to protect downstream cylinders and pumps from overpressurization.
Integrated Load Check Valves: Each working section contains an independent internal load-holding check valve. This prevents hydraulic fluid from backflowing, ensuring a raised load (like a small tractor crane arm) does not sag or drop accidentally when shifting the lever.
Power Beyond (Carry-Over) Ready: Includes a machined channel that accepts a specialized carry-over sleeve in the "N" port. This allows high-pressure oil to pass safely downstream to feed a secondary valve block without overpressurizing the tank line.
Flexible Control Logic: Spools can be set up as Spring-Return to Center (neutralizes when released) or Detent (clicks and locks into a specific active position, ideal for motor driving).
| Parameter | Official Value | Unit | Remarks |
|---|---|---|---|
| Construction | Monoblock | — | Available with 1–7 working sections integrated into a single cast-iron body |
| Material | High-Strength Cast Iron (EN-GJL300) | — | Excellent sealing performance, pressure resistance, and wear resistance |
| Nominal Flow Rate | 40 | L/min | Recommended operating flow, approximately 10.6 GPM; suitable for small- and medium-sized hydraulic systems |
| Maximum Pressure – P Port | 250 (3,625) | bar (psi) | Maximum permissible continuous working pressure in the main inlet circuit |
| Maximum Pressure – A/B Ports | 300 (4,350) | bar (psi) | Maximum short-term pressure at the actuator ports connected to small cylinders or hydraulic motors |
| Maximum Back Pressure – T Port | 50 (725) | bar (psi) | Maximum permissible return-line back pressure; excessive pressure may damage the spool seals |
| Internal Relief Valve Adjustment Range | 50–250 | bar | Built-in safety relief valve; factory setting is normally 175–180 bar |
| Internal Leakage – A/B to T | ≤ 6 at 100 bar and 46 cSt | cm³/min | Minimal natural internal leakage when the spool is in the neutral position, helping prevent actuator drift |
| Spool Stroke | ±6 | mm | Physical travel of the internal spool when the control lever is fully operated |
Applications
Agricultural Equipment: Front-end loaders on tractors, bale wrappers, three-point hitches, and timber trailers.
Material Handling: Small mobile cranes, forklifts, tail lifts, and tow trucks.
Industrial Automation: Small to medium hydraulic power packs and waste compactors.
P40 valves are typically packaged securely to prevent damage during transit. The packaging includes:
Protective Wrapping: To safeguard the pump from environmental damage.
Custom Crates: For larger, heavier pumps, ensuring safe handling.
Documentation: Includes installation, maintenance instructions, and warranty details.
Delivery time depends on the model, customizations, and location but typically ranges from 2 to 6 weeks from the order date.
The Joystick Kit: The P40 features a highly modular design that supports a 2-axis joystick kit. This kit mechanically links two adjacent spools together under a single cross-lever handle.
Operational Logic: This setup allows you to control two independent hydraulic functions simultaneously with one hand. For example, moving the joystick forward/backward controls a tractor loader boom, while moving it left/right controls the bucket tilt, making operation significantly faster and smoother.
Yes, with proper porting: Standard P40 spools are double-acting (Type A), designed to drive fluid to both ports A and B. To run a single-acting cylinder (which relies on gravity or a spring to retract), plug one of the working ports.
The Setup: Connect the single hose of your cylinder to Port A, and screw a solid steel plug tightly into Port B. When you push the handle forward, oil pumps into Port A to lift the load. When you pull the handle backward into the Port B position, the internal relief channel opens, letting gravity push the oil back out of Port A to the tank.
Excessive Tank (T-Port) Back-Pressure: The P40 tank port has a strict maximum pressure threshold of 50 bar (725 psi). If you run a return line that is too narrow, use restrictive quick-disconnect couplers, or plug the tank port entirely while using Power Beyond, back-pressure will spike.
Blown Spool Seals: This back-pressure will effortlessly blow past the soft rubber O-rings or wiper seals located at the ends of the spools, causing hydraulic oil to flood the handle assembly and leak out of the dust boots. Always make sure your return line runs unrestricted directly to the fluid reservoir.
Locate the Adjuster: The built-in relief valve is located right next to the high-pressure inlet (P) port, covered by a protective chrome or plastic hex cap. Remove the cap to reveal the internal adjustment screw.
The Calibration: Hook up a reliable hydraulic pressure gauge inline. Turn the screw clockwise to increase the pressure or counter-clockwise to lower it. The P40 body safely supports up to 250 bar (3,625 psi). Never tighten the screw all the way down without a gauge, or you risk blowing your hydraulic pump or cracking the valve casing.
Incorrect Closed-Center Plug Installed: If your tractor or machine runs a standard Open-Center (fixed gear pump) system, the oil must flow freely from P to T when the handles are in neutral. If someone accidentally installed a Closed-Center plug or a Power Beyond sleeve in the "N" port without completing the downstream loop, the neutral oil pathway becomes entirely blocked.
Continuous High-Pressure Bypass: This forces the hydraulic system to constantly blow over its main relief valve at maximum pressure even when idle, putting a massive load on the engine, wasting fuel, and causing the hydraulic oil to overheat within minutes. Remove any incorrect conversion plugs to restore the standard open-center pathway.
Yes, we support OEM and customization, including nameplate, packaging, and specific performance requirements. Send us your drawings or specifications for evaluation.
P40 Valve are manufactured in compliance with international standards, ensuring high performance and reliability:
ISO 9001: Certified for quality management systems.
CE Certification: Ensures compliance with European safety, health, and environmental protection standards.
RoHS Compliance: Ensures the pump does not contain hazardous materials.
Factory Testing: Every valve is rigorously tested for performance, pressure, and leak integrity before shipping.
1.What's our advantages?
Factory established in 2005;
With a great deal of production experience;
80+ employees become the professional team;
Constant updated ERP system ensure efficiency of work;
Sophisticated equipment ehanced the accuracy of products;
Professional salesmen provide the greast service;
With a large number of famous customers all over the world;
Great after-sales service;
With the long term cooperation with famous logistics and express company in China,provide the better goods service.
Small order/sample order,full payment in advance; Big orders send the first payment 30% before the production,and the balance before shippment.We'll show the photos of the products and packages before delivery.
Of course we can. Just send me your logo we can make it for you.
America(40.5%):USA, Canada, Argentina, Brazil
Europe(30.8%):Italy,Germany,England,Holland,Spain,Swiss,Finland,Russia,Poland.
Asia(23.5%):Korea,singapore,India,Turkey,Vietnam,Saudi Arabia,Syria, Israel,Lebanon.
Others(5.8%).
The Cissoko hydraulic pump manufacturing facility is a specialized industrial plant that focuses on producing hydraulic pumps and related components. These factories are equipped with advanced machinery and technology to fabricate high-quality pumps designed for a wide range of applications, from heavy equipment and machinery to automotive and industrial systems.
The production process typically involves precision engineering, where raw materials like metals and alloys are processed into pump components such as gears, pistons, cylinders, and seals. These parts are then assembled into fully functional hydraulic pumps, which are tested for performance and quality control to ensure reliability, efficiency, and durability under various working conditions.
Cissoko Hydraulic's manufacturing facilities for hydraulic pumps maintain stringent quality standards, often adhering to international certifications, to meet the expectations of customers in industries such as construction, agriculture, automotive, and manufacturing.
All hydraulic pumps produced by Cissoko Hydraulic have undergone compliance testing, ensuring their quality and reliability.
To meet the diverse needs of different industries, the Cissoko hydraulic offer customization options, such as specialized seals, materials, and pump configurations. These facilities often work closely with engineering teams to develop tailored solutions for specific applications, from high-pressure systems to low-flow, high-efficiency pumps.
Each pump undergoes a rigorous quality control process, where pressure tests and performance assessments are conducted to ensure that the pumps meet the required standards for flow rate, pressure capacity, and durability.
