KRACHT DV B Hydraulically Pilot Controlled Valve

Overview

KRACHT DV B is a hydraulically pilot-controlled pressure relief valve from KRACHT GmbH of Germany, built to protect the largest-flow hydraulic and lubrication circuits in KRACHT’s pressure relief valve range, with capacity up to 1,800 l/min and a maximum nominal pressure of 210 bar. The DV B uses external hydraulic pilot control rather than a spring-loaded pilot integrated into the main body, meaning the valve’s control oil can be discharged either internally back through the main valve or routed externally to a separate return line — a flexibility that lets system designers isolate control-oil heat and contamination from the main flow path on large oil hydraulics and lubrication installations. A dedicated measuring port built into the valve body allows pressure to be monitored directly at the valve without additional instrumentation fittings.

With engineering support in Muscat, Seven Star LLC supplies the DV B hydraulically pilot-controlled valve to industrial, marine, and process customers throughout the Sultanate of Oman and the wider GCC. Engineering teams in Muscat, Sohar, and Salalah rely on Seven Star LLC for genuine German-manufactured KRACHT hardware and for guidance on internal versus external control oil routing, measuring port instrumentation, and set-pressure selection for high-flow hydraulic systems.

Operating Principle

The KRACHT DV B operates as a hydraulically pilot-controlled relief valve: a remote or integrated pilot stage senses system pressure and hydraulically actuates the main valve’s large-diameter control piston, which in turn opens the main flow path once the set pressure is exceeded. Because the main element is driven hydraulically by the pilot signal rather than mechanically by a single spring acting directly on the main spool, the DV B can handle far larger flow rates — up to 1,800 l/min — while still achieving controlled, proportional opening rather than abrupt full-flow event. The valve’s internal or external control oil discharge option determines where the small volume of oil used to actuate the pilot stage is returned: internally, it rejoins the main flow downstream of the valve, while externally, it is piped to a separate low-pressure return line, which is useful when the control oil needs to bypass a heat exchanger or filtration stage dedicated to the main circuit.

The integrated measuring port provides a direct, factory-machined connection point for a pressure gauge or transducer at the valve itself, removing the need to tap into adjacent pipework and giving commissioning engineers an accurate reading of actual relief pressure rather than inferred value from a remote gauge. On request, KRACHT also offers the DV B with an additional integrated 2/2-directional control valve, which allows the relief valve to be switched into a pressure-minimized circulation mode — useful for unloading a large pump to near-zero pressure during idle periods without a separate unloading valve in the circuit.

Engineering Design of the KRACHT DV B

The KRACHT DV B is built around a substantial cast valve body sized for its high flow rating, finished in KRACHT’s blue housing coating with a large-diameter pilot control head mounted on top of the main body. The measuring port is machined directly into the valve body adjacent to the main flow path, and separate porting is provided for the external control oil connection when that discharge mode is selected. The valve’s control piston and pilot stage are manufactured to close tolerances appropriate for reliable proportional operation at flows approaching 1,800 l/min, and the body casting includes mounting provisions suited to large hydraulic power unit and lubrication skid installations.

Where the optional integrated 2/2-directional control valve is fitted, it is mounted as an additional module on the main DV B body rather than as a separate in-line component, keeping the combined unloading-and-relief function within a single compact assembly. This modular approach lets Seven Star LLC configure the DV B to match the exact control architecture — standard relief only, or relief with unloading — that a given hydraulic power unit or lubrication system requires.

Key Features

The KRACHT DV B hydraulically pilot-controlled valve is engineered for large-flow oil hydraulics and lubrication technology:

• The KRACHT DV B’s hydraulically pilot-controlled main stage handles flow rates up to 1,800 l/min with proportional, controlled opening.
• Maximum nominal pressure of 210 bar suits large hydraulic power units and industrial lubrication systems.
• Selectable internal or external control oil discharge lets designers isolate pilot control oil from the main circuit.
• Integrated measuring port provides a factory-machined connection for direct pressure monitoring at the valve.
• Optional integrated 2/2-directional control valve enables pressure-minimized circulation for pump unloading.
• Operating temperature range of -15°C to 150°C supports demanding lubrication and process-heat applications.
• Robust cast-body construction sized for high-flow duty on large hydraulic power units and lubrication skids.
• Modular design allows the KRACHT DV B to be configured as standard relief or combined relief-and-unloading in a single assembly.

Industrial Applications

The KRACHT DV B hydraulically pilot-controlled valve is specified on large-scale hydraulic power units and centralized lubrication systems across Oman’s process, marine, and heavy industrial sectors, where flow demands routinely exceed what a directly controlled or spring-pilot valve can handle efficiently. Process plants in Sohar’s industrial and refining zones use valves in this class to manage relief duty on large pump stations and centralized oil hydraulics, taking advantage of the DV B’s external control oil discharge option to keep pilot oil separate from filtration circuits serving the main flow. Marine engine-room and deck machinery hydraulics supported through Salalah’s port facilities also benefit from the DV B’s wide temperature rating and integrated measuring port, which simplifies commissioning and routine pressure verification on vessels operating across varying ambient conditions.

Seven Star LLC supplies the KRACHT DV B to industrial power unit builders, marine service yards, and lubrication system integrators across Muscat and the broader GCC, with manufacturer documentation and technical support. Plant engineers in the Sohar and Salalah economic zones sizing relief protection for large-flow hydraulic or lubrication systems can rely on Seven Star LLC’s team to confirm control oil routing, measuring port instrumentation, and the optional 2/2-directional unloading configuration for their installation.

Technical Specifications

Key technical parameters of the KRACHT DV B hydraulically pilot-controlled valve are summarized below; the KRACHT DV B is also available with the optional integrated unloading module.

Request a Quote for KRACHT DV B

Seven Star LLC invites facility engineers, procurement teams, and hydraulic power unit builders across Oman and the GCC to submit a formal RFQ for the KRACHT DV B hydraulically pilot-controlled valve. Lead time and freight options are confirmed at quotation, and the full technical datasheet can be downloaded directly from this product page for engineering review. For guidance on KRACHT DV B control oil routing, measuring port instrumentation, or the optional 2/2-directional unloading configuration, contact Seven Star LLC’s instrumentation and hydraulics division directly. Working closely with plant engineers in the region, Seven Star LLC supplies German-manufactured hardware with manufacturer documentation and dedicated local technical support on every order.

Browse the full KRACHT range or see more Safety Relief Valves products supplied by Seven Star LLC in Oman and the GCC.