Eight-position shifting valve 8P-1S

Eight-position shifting valve 8P-1S

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

 4 year year

Product details

QF501A Two-port Air Switch Full Specification

Full Name: QF501A 2/2 Manual Rotary Air Switch (2-position 3-way rotary valve with 2 main external ports for on-off control)

1. Model Code Definition

- QF: Special pneumatic valve series for oil drilling rigs & heavy construction machinery

- 501: Base series of manual rotary directional valve

- A: Version code, 2-port on-off type (QF501B = 3-port type, QF501C = 4-port type)

Basic Dimensions & Port Size

- Connection Thread: 2 pcs ZG1/4" (55° British taper pipe thread)

- Nominal Bore: 8mm

- Overall Dimension: L87 × W94 × H170mm

- Net Weight: 1.3kg

2. Technical Parameters

- Operation Mode: Manual lever rotary actuation with mechanical position locking (no automatic reset)

- Working Medium: Dry compressed air, compatible with air-oil mixed gas for oilfield service

- Working Pressure: 0~1.25MPa, recommended operating pressure: 0.6~0.8MPa

- Temperature Range: Standard -25℃ ~ +60℃; customized low temp version: -40℃ ~ +60℃

- Body Material: Ductile cast iron; internal spool: hard alloy slide plate structure

- Seal Material: Oil-resistant NBR rubber, ultra-low air leakage

- Mounting: Flange base mounting with 4×M6 fixing holes

- Effective Flow Area: 40mm², high flow rate for pilot air circuits

3. Construction Composition

Consists of slide plate spool, valve seat body, rotary main shaft, lever assembly, positioning spring, sealing kits and bonnet. Rotate the lever to shift the spool position for air circuit on/off switching; snap-in positioning prevents accidental displacement under vibration.

4. Working Principle (2 Position Logic)

Built-in ports: P (air supply), A (actuator outlet), O (exhaust port); only P & A ports are externally led out:

1. OFF Position: Port P blocked, Port A connected to exhaust O → Downstream piping/cylinder vents and depressurizes

2. ON Position: Port P directly connected to Port A, exhaust port O sealed → Air supply feeds to downstream actuators

5. Main Applications (Matched with 23Q-L8 / VSP3301-31 Pneumatic Slide Valve)

Widely used as master pilot switch paired with 23Q-L8 pneumatic slide valve to form complete pneumatic control loop on oilfield drilling rigs, workover rigs and fracturing trucks:

- Manual control of main clutch & parallel clutch for drilling rigs

- On-off control for drilling pump and diesel engine pneumatic throttle

- Master air switch for wellhead blowout preventer boxes & pneumatic locking units

- General air circuit shut-off valve for mining tunneling equipment & special heavy vehicles

6. Features & Selection Notes

1. Cast iron body with excellent vibration & mud/dust resistance, standard for outdoor oilfield operation

2. Mechanical snap lock structure, anti-misoperation during vehicle bumping

3. Modular interchangeability: QF501A / QF501B / QF501C share identical mounting footprint for on-site replacement

4. Thread Reminder: ZG1/4 taper thread cannot be directly assembled with G1/4 parallel thread without reducer adapters

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

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Address: Ningbo, China

Main Product: hydraulic motor, gear box, hydraulic pump, hydraulic valve , hydraulic winch, hydraulic system

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