Parker DSH101NR Threaded Cartridge Valve

DSH101NR

DSH101: Series – 2-way poppet type solenoid cartridge valve, standard cavity C10-2

N = Normally Open: Open when de-energized, closed when energized

R = Reverse free flow

Function: Flow permitted 2→1 when open; closed upon energization; free reverse flow 1→2 (integral check function)

2. Main Technical Specifications

3. Operating Logic
4. Solenoid de-energized (normal state): Valve open → Port 2 ↔ Port 1 connected
5. Solenoid energized: Solenoid actuates poppet to close → Flow 2→1 blocked; Free flow 1→2 remains available

Typical applications: Single-acting cylinder pressure relief, load holding, lowering cut-off, accumulator unloading circuits

4. Common Suffix Options (Complete Model Examples)

DSH101NR24: 24VDC coil (most common)

DSH101NR12: 12VDC coil

DSH101NRMS: With manual override button

DSH101NRTN: Deutsch DT04 connector

DSH101NREVS: Deutsch EV series connector

5. Quick Series Comparison (Selection Guidance)

DSH101C / CR: Normally Closed (NC)

DSH101N / NR: Normally Open (NO)

Suffix without R: Restricted reverse flow; Suffix R = Free reverse flow (NR/CR)

6. Domestic Equivalent Reference

Interchangeable C10-2 cavity 2-way solenoid poppet valve with NO + free reverse flow:

HydraForce SV10-21, Vickers, DIP, Jialang equivalent cartridge valves.

Upon request, I can provide:

1. Text dimension drawing for C10-2 manifold cavity
2. Typical circuit drawing (single-acting cylinder lowering control)
3. Excerpts from original manufacturer datasheet

Application Scenarios of Parker DSH101NR

Key function recap for selection reference

DSH101NR: Normally Open + Reverse Free Flow

De-energized: Passage 2→1 open; Energized: 2→1 blocked; permanent free flow 1→2 (built-in check valve feature)

Poppet construction provides low closed leakage; C10-2 mounting cavity, max 350 bar, rated flow 60 L/min.

1. Mobile Hydraulics (Primary Application Field)

1.1 Single-Acting Cylinder Lifting & Load Lowering Circuit (Typical Use)

Outrigger cylinders & telescopic single-acting cylinders on aerial work platforms

Tipper truck, sanitation equipment lift cylinders

Material clamping & compression single-acting hydraulic cylinders for construction machinery

Circuit Operation Logic:

De-energized state: Cylinder cap side connected to tank, cylinder lowers under load weight

Energized state: Tank path blocked, cylinder locked for load holding

During lifting, pressure oil flows freely 1→2 (Suffix R free reverse flow supplies lifting flow, no separate check valve required)

✅ Advantage: Single valve realizes lowering on/off control + lifting check function, simplifies manifold circuit layout.

1.2 Accumulator Safety Unloading / Pressure Relief Circuit

Accumulator pressure holding systems:

Machine shutdown / emergency condition: Solenoid de-energized, accumulator pressure relieved via 2→1

Normal operation: Solenoid energized, accumulator circuit sealed to maintain pressure

System charging: Fluid flows freely 1→2 into accumulator

Widely used: Mobile hydraulic clamps, hydraulic breaker accumulator circuits.

1.3 Brake Drain Control for Unidirectional Hydraulic Motors

Controls motor backpressure line for unidirectional rotary hydraulic motors:

Energized to block backpressure for braking; de-energized to open circuit and allow motor rotation; supply oil passes freely through 1→2.

2. Industrial Hydraulic Power Units

2.1 Hydraulic Clamps & Press Equipment – Single-Acting Clamp Cylinders

Clamp extension: Pressure oil flows freely 1→2

Clamp retraction: Spring / load weight retracts cylinder when valve de-energized to open tank line

Standby during production: Solenoid energized to block return line and maintain clamping force; low poppet leakage minimizes pressure decay.

2.2 Pressure Chamber Relief & Safety Dump Valve

Mold hydraulics, hydraulic test benches:

Energized to seal high-pressure chamber during operation; de-energized to automatically depressurize chamber after process completion or safety trigger.

2.3 Circuit Selector & Pump Bypass Unloading Circuit

Pump bypass unloading: Normally open (de-energized) for direct pump unloading; energized to cut unloading path and build system pressure.

3. Unsuitable Working Conditions (Selection Pitfalls)
4. Bi-directional locking for double-acting cylinders ❌

Only blocks flow 2→1; path 1→2 is permanently open, cannot seal both directions. For bi-directional pressure holding, select DSH101CR or bi-directional poppet valves.

2. Application requiring load holding after power loss, relief on energization ❌

DSH101NR: De-energized open, energized closed. If load must remain locked when power fails, select DSH101CR (Normally Closed, free reverse flow).

3. Continuous steady flow exceeding 60 L/min: Upgrade to DSH161 series.
4. Function Comparison for Fast Selection

DSH101NR: Normally Open, free reverse flow → De-energized relief, energized load holding (first choice for single-acting cylinder lowering)

DSH101CR: Normally Closed, free reverse flow → De-energized load holding, energized relief (safety critical power-off holding applications)

Installation Guidelines for Parker DSH101NR (C10-2 Cavity)

1. Pre-Installation Inspection (Critical)

1.1 Verify Model & Valve Function

DSH101NR: Normally Open + Reverse Free Flow

Port definition: 2→1 controlled flow path; permanent free flow 1→2

⚠️ Reversed port connection will completely invalidate circuit function!

Manifold port marking must match valve flow direction.

1.2 Manifold Cavity Inspection

Standard cavity: SAE C10-2. Non-standard machining will cause seal leakage and valve sticking.

Thoroughly clean cavity: Remove metal chips, burrs and seal debris. Flush with high-pressure oil; do not insert cotton yarn into cavity (risk of fiber contamination and valve seizure).

Inspect sealing face for scratches; surface damage will cause external leakage of outer D-ring.

1.3 Seal Verification

Standard fitted PU polyurethane D-ring (no back-up ring required)

Mineral oil, normal temperature: PU (-37～93℃)

High temperature / synthetic fluid: Replace with NBR or FKM fluorocarbon seal

Never reuse removed seals. Lubricate lightly with clean hydraulic oil before installation. Do not use grease (risk of carbonization and valve sticking).

2. Cartridge Installation Torque (OEM Standard)

Cartridge threaded torque into manifold: 69～75 N·m

✅ Torque wrench is mandatory!

Insufficient torque: Outer D-ring incomplete sealing → external leakage

Excessive torque: Thread stripping, manifold cavity deformation, internal valve damage, sluggish operation and increased leakage.

Installation Procedure:

1. Ensure seal fully seated in cartridge groove without twist or extrusion
2. Thread cartridge manually until seal contacts manifold face
3. Tighten to specified torque with torque wrench
4. Do NOT rotate cartridge by gripping solenoid housing; only clamp the hexagonal threaded section!
5. Solenoid Coil Assembly Requirements
6. Solenoid locking nut torque: 7～10 N·m

Over-tightening risks cracking solenoid housing.

2. Assembly sequence:

Positioning washer on cartridge top → Slide coil over actuator pin → Secure with locking nut.

Ensure coil base fully seats flat on cartridge top without tilt or gap.

3. Coil can be rotated 360° to adjust cable outlet orientation for convenient wiring.
4. Models with manual override (MS suffix): Confirm manual button can be fully depressed without interference after assembly.
5. Electrical Wiring Requirements
6. Supply voltage must stay within 85%～110% of nominal rating. For 24VDC coil, avoid voltage below 20.4V. Undervoltage leads to unreliable valve closure and load slipping.
7. Waterproof connector treatment: Adequate sealing required for mobile / outdoor equipment to prevent water ingress and coil short circuit. Fit O-rings correctly on Deutsch DT/EV connectors.
8. Heat dissipation: Coil temperature rises during frequent continuous cycling. Do not insulate coil; maintain ventilation space.
9. EMI control: Route wiring away from inverters and high-power motors to avoid unintended valve actuation.
10. Hydraulic System & Flushing Requirements
11. System cleanliness level: ISO 4406 18/16/13. Install upstream filter. Contamination will score poppet sealing surface and cause permanent internal leakage.
12. Flush manifold without cartridge installed!

Install DSH101NR only after flushing is complete, preventing weld slag entering valve internals.

3. Initial commissioning: Run no-load at low speed and verify:

No external leakage at manifold interface

Acceptable pressure decay rate during load holding

Fast, consistent valve actuation on energization / de-energization without delay.

6. Mounting Orientation & Operating Limits
7. No mandatory installation orientation: Horizontal or vertical mounting permitted.

For vertically downward loaded cylinders, avoid cartridge facing downwards long-term to prevent sediment accumulation.

2. Fluid viscosity range: 6～420 cSt. Avoid excessive viscosity at low ambient temperature which slows response.
3. Rated flow ≤60 L/min; limit pressure differential under sustained high flow to prevent excessive heat generation.
4. Prohibited Operations & Common Installation Mistakes

❌ Do not tighten by experience without torque wrench

❌ Do not rotate cartridge by clamping solenoid housing, causing eccentric actuator pin and seizure

❌ Do not mix different seal materials; no extra back-up rings needed for PU D-ring

❌ Do not apply thread sealant or PTFE tape on cartridge threads (sealant entering valve causes poppet seizure)

❌ Do not swap Port 1 and Port 2 (reversed flow destroys circuit function)

❌ Do not install valve before full system flushing (high risk of internal leakage and load drift)

8. Commissioning Check List
9. Static test: De-energized = passage open; Energized = flow 2→1 blocked; permanent free flow 1→2
10. Pressure holding test: Monitor pressure decay rate under energized lock condition to evaluate poppet internal leakage
11. Inspect all sealing positions for external leakage
12. Verify no abnormal overheating of solenoid after continuous energization