157B9700 Danfoss PVG32 PVBS Main Spool 10 L/min

Product Overview

157B9700, 157B9701, 157B9702, 157B9703, 157B9710, 157B9711, 157B9712 and 157B9713 are Danfoss PVG32 PVBS main spool part numbers, not complete PVG proportional valve groups.

According to Danfoss technical documentation:

• 157B9700–157B9703 are PVMR symmetric flow-control spools with a closed neutral position.
• 157B9710–157B9713 are PVMR symmetric flow-control spools with a throttled-open neutral position.
• The listed variants provide 10, 25, 40 and 65 L/min flow ratings respectively.

The PVBS main spool is a critical metering element inside a PVG32 work section. Its spool geometry determines the flow characteristics between the pressure, work-port and tank paths. Danfoss states that PVBS spools can be actuated mechanically through PVM, electrically through PVE/PVHC, or hydraulically through PVH, depending on the configured valve architecture.

For this reason, the original title should not present these part numbers as a universal PVG16/32/128/256 proportional valve group. The verified technical identity is more accurately described as Danfoss PVG32 PVBS Main Spool.

Technical Specifications

157B9700

• Manufacturer: Danfoss
• Series: PVG32
• Component: PVBS Main Spool
• Actuation reference: PVMR
• Neutral position: Closed
• Flow rating: 10 L/min [2.6 US gal/min]
• A → T: 10 L/min
• P → A: 10 L/min
• P → B: 10 L/min
• B → T: 10 L/min
• Spool type: Symmetric Flow Control Spool

157B9701

• Series: PVG32
• Component: PVBS Main Spool
• Actuation reference: PVMR
• Neutral position: Closed
• Flow rating: 25 L/min [6.6 US gal/min]
• A → T / P → A / P → B / B → T: 25 L/min

157B9702

• Series: PVG32
• Component: PVBS Main Spool
• Actuation reference: PVMR
• Neutral position: Closed
• Flow rating: 40 L/min [10.6 US gal/min]
• A → T / P → A / P → B / B → T: 40 L/min

157B9703

• Series: PVG32
• Component: PVBS Main Spool
• Actuation reference: PVMR
• Neutral position: Closed
• Flow rating: 65 L/min [17.2 US gal/min]
• A → T / P → A / P → B / B → T: 65 L/min

157B9710

• Series: PVG32
• Component: PVBS Main Spool
• Actuation reference: PVMR
• Neutral position: Throttled Open
• Flow rating: 10 L/min [2.6 US gal/min]
• A → T / P → A / P → B / B → T: 10 L/min

157B9711

• Series: PVG32
• Component: PVBS Main Spool
• Actuation reference: PVMR
• Neutral position: Throttled Open
• Flow rating: 25 L/min [6.6 US gal/min]
• A → T / P → A / P → B / B → T: 25 L/min

157B9712

• Series: PVG32
• Component: PVBS Main Spool
• Actuation reference: PVMR
• Neutral position: Throttled Open
• Flow rating: 40 L/min [10.6 US gal/min]
• A → T / P → A / P → B / B → T: 40 L/min

157B9713

• Series: PVG32
• Component: PVBS Main Spool
• Actuation reference: PVMR
• Neutral position: Throttled Open
• Flow rating: 65 L/min [17.2 US gal/min]
• A → T / P → A / P → B / B → T: 65 L/min

General Engineering Data

• PVBS function: Flow-control main spool
• PVG32 maximum pump pressure: 350 bar [5,076 psi]
• PVG32 maximum pump flow: 160 L/min [42 US gal/min]
• Possible actuation methods: PVM mechanical, PVE/PVHC electrical or PVH hydraulic
• Documented PVBS spool-platform weight: approximately 0.25 kg [0.55 lb]
• Fluid temperature: -30°C to 90°C
• Recommended fluid temperature: 30°C to 60°C
• Fluid viscosity: 4–460 mm²/s
• Recommended viscosity: 12–75 mm²/s
• Cleanliness for mechanical activation: 23/19/16 ISO 4406
• Cleanliness for PVE activation: 18/16/13 ISO 4406

Not applicable / not independently specified:

• Displacement: Not applicable
• Rotational speed: Not applicable
• Independent peak-pressure rating for the spool: Not identified in the cited Danfoss documentation

The 350 bar figure is the documented PVG32 maximum pump pressure and should not be presented as an independently verified “peak pressure” for the individual spool.

Key Technical Advantages

Precise Flow-Class Selection

The 157B97xx family provides distinct 10, 25, 40 and 65 L/min flow classes. This allows the PVG32 work section to be configured according to actuator flow requirements rather than relying on a generic spool specification.

Defined Neutral-Position Characteristics

The 157B9700–157B9703 family uses a closed neutral position, while 157B9710–157B9713 uses a throttled-open neutral position. This distinction directly affects neutral-state flow behavior and must be considered during replacement.

Symmetric Flow Control

The documented A→T, P→A, P→B and B→T flow ratings are matched within each spool class, providing a symmetric flow-control architecture suitable for bidirectional actuator operation.

Multiple Actuation Options

PVBS spools can operate within valve configurations using mechanical PVM, electrical PVE/PVHC or hydraulic PVH actuation. This makes the PVBS platform suitable for different control architectures while retaining modular PVG system design.

Modular Hydraulic System Integration

PVG systems use a modular architecture in which the work section, main spool, actuator and auxiliary modules are selected according to the machine function. Danfoss currently positions PVG16, PVG32, PVG128 and PVG256 as different valve sizes for different flow requirements; however, the verified documentation does not support claiming that every 157B97xx spool listed here is universally interchangeable across all four valve sizes.

Engineering-Focused Replacement

Reliable aftermarket replacement requires more than matching the number printed on a spool. The correct selection should consider:

Part number + valve size + flow rating + neutral position + actuation configuration

Our replacement process can be based on the original part number and configuration, followed by 100% simulated working-condition testing to validate key hydraulic functions before delivery.

Application Areas

Typical applications include:

• Construction machinery
• Excavators
• Wheel loaders
• Material-handling equipment
• Agricultural machinery
• Forestry machinery
• Road construction equipment
• Cranes and lifting machinery
• Mobile hydraulic equipment
• Hydraulic cylinder systems
• Hydraulic motor systems

PVG32 work sections interface the proportional valve group with hydraulic work functions such as cylinders and motors, making PVBS main spools a key metering component within mobile hydraulic control systems.

Expert Maintenance Tips

Verify Neutral Position Before Replacement

Do not substitute a closed-neutral spool with a throttled-open-neutral spool merely because the flow rating is identical.

• 157B9700–157B9703: Closed Neutral
• 157B9710–157B9713: Throttled Open Neutral

Match the Flow Rating

Always verify the required flow class before replacement:

• 157B9700 / 157B9710: 10 L/min
• 157B9701 / 157B9711: 25 L/min
• 157B9702 / 157B9712: 40 L/min
• 157B9703 / 157B9713: 65 L/min

Inspect Spool and Bore Condition

During service, inspect the spool surface, valve bore, clearance condition and contamination level. Scoring or abnormal wear can increase internal leakage and alter the intended flow response.

Maintain Hydraulic Cleanliness

Follow Danfoss cleanliness recommendations and prevent machining particles, seal fragments and assembly debris from entering the spool/bore interface.

Confirm Actuator Compatibility

PVBS spools may be operated by different actuation systems, but the selected spool and actuator must be compatible with the specific PVG configuration. Danfoss specifically warns that certain spool characteristics are not suitable for every actuator combination.

Conduct Functional Testing After Installation

A replacement spool should be checked for:

• Neutral pressure behavior
• A/B port flow
• Directional response
• Initial spool movement
• Full-stroke flow
• Internal leakage
• LS response where applicable

A 100% simulated working-condition test can further reduce commissioning risk before the replacement component reaches the machine.