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SHPI

SC 08-02

SHPI Pneumatic Flow Control Valve — 8 mm Tube, PT 1/4″ Thread, Meter-out / Meter-in Speed Controller

The SC 08-02 is an industrial pneumatic speed controller from the One-Touch series by SHPI (Taiwan) for precise control of pneumatic cylinder rod speed. Tube 8 mm, thread
PT 1/4″ (BSPT) — the most widely used industrial standard for medium and large pneumatic cylinders. Working pressure 0–150 PSI, vacuum support to -750 mmHg, 360° swivel body,
pre-applied PTFE thread sealant.

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Description

Technical Specifications — SC 08-02

Tube OD (ØD) 8 mm
Thread (T) PT 1/4″ × P1.814 (BSPT tapered)
Working medium Compressed air
Working pressure 0–150 PSI (0–9.9 kgf/cm²)
Vacuum (negative pressure) to −750 mmHg (−29.5 inHg)
Temperature range 0°C – +60°C
Body material Nickel-plated brass
Collet material POM (polyoxymethylene)
Dimension E (mm) 37.5
Height L MAX (mm) 48.5
Dimension A (mm) 11.4
Wrench H Hex (mm) 14
Body rotation 360° (Swivel)
Thread seal Pre-applied PTFE coating

Design Features of the SC 08-02

PT 1/4″ Thread with Pre-Applied PTFE Coating

BSPT tapered thread self-seals on tightening. SHPI additionally applies PTFE coating at the factory — eliminating the need for tape or liquid sealants. Leak-free connection immediately on installation.

One-Touch Collet for 8 mm Tube

The One-Touch mechanism fixes the 8 mm tube with a single push, no tools needed. Collet material — POM: wear-resistant plastic with precise dimensions ensuring reliable grip without deforming the tube.

360° Swivel Body

The elbow body rotates freely around the threaded section 360° — before and after tightening in the port. Allows tube routing in any direction even in tight installations.

Precision Needle Valve

The needle valve provides linear and stable flow control. Settings do not drift due to vibration or pressure fluctuations — particularly important for high-speed production lines.

Vacuum Compatibility

SC 08-02 officially supports negative pressure to -750 mmHg — usable in vacuum lines for controlling the speed of vacuum creation/release in suction cups and positioning systems.

How to Install SC 08-02: Step-by-Step

Step 1. Choose the control type (Meter-out/Meter-in) and fit to the appropriate cylinder port.

Step 2. Thread the PT 1/4″ into the cylinder port with a 14 mm wrench. No PTFE tape needed.

Step 3. Rotate the body to the desired angle (360°).

Step 4. Push the 8 mm tube into the One-Touch collet until it clicks. Confirm with a gentle pull.

Step 5. Open the air supply and adjust the needle: clockwise = slower, anticlockwise = faster. Run a test cycle and fine-tune as needed.

“In my experience, using SHPI SC series throttles significantly reduces the risk of pneumatic cylinder piston “jumping” at low speeds. I recommend paying special attention to the color coding: the blue sleeve (Meter-out) is the gold standard for cylinder outlet adjustment, ensuring maximum smoothness. Thanks to the nickel-plated brass, these fittings offer excellent corrosion resistance in the humid environment of compressor condensate.”.

Applications for the SC 08-02

Automated production lines — speed control of pusher, lifter and clamp cylinders. PT 1/4″ is the standard port thread for cylinders with bore diameters from 25 to 80 mm, the most common actuator size in mechanical engineering.

Packaging and filling machinery — synchronising actuator speed with conveyor timing. Stable needle ensures cycle repeatability at high operating frequencies.

Automotive manufacturing and body shops — pneumatic fixtures, presses, paint shop manipulators. 8 mm tube and PT 1/4″ deliver the air flow needed for cylinders generating 100–1000 N force.

Robotics and pick-and-place systems — for vacuum suction cup grippers, SC 08-02 can control both the pneumatic actuator and vacuum flow speed, thanks to -750 mmHg vacuum compatibility.

Pneumatic presses and stamping equipment — controlling punch descent and return speed. Meter-out (blue) on both cylinder ports is the gold standard for press equipment where position repeatability matters.

Compatible SHPI Tubes for SC 08-02

SC 08-02 requires tubes with an outer diameter of exactly 8 mm. Available from Acvatron:

  • PU polyurethane tubes 8×5 mm (8*5 mm SHPI) — flexible, for moving mechanisms.
  • Nylon PA tubes 8 mm — rigid, for fixed pneumatic lines with higher pressure and minimal losses.

Fitting Selection Guide for Pneumatic Cylinders

Selecting the right fitting for a pneumatic cylinder is a critical stage that determines not only the system’s airtightness but also the smoothness of stroke, operating speed, and equipment longevity. Based on SHPI technical catalogs, the selection algorithm includes the following steps:

1. Identify Cylinder Port Thread Type and Size

The first step is to determine the port size in the pneumatic cylinder end cap.

  • For small cylinders: Metric M5 threads are most common (e.g., PC 06-M5 or SC 04-M3 series).

  • For medium and large cylinders: Tapered PT (BSPT) or parallel G (BSPP) threads in sizes 1/8″, 1/4″, 3/8″, or 1/2″ are used.

  • Key Advantage: SHPI tapered threads come with pre-applied Teflon coating, eliminating the need for PTFE tape and ensuring instant sealing.

2. Choose Functionality: Standard Fitting or Speed Controller?

  • If speed adjustment is NOT required: Use standard One-Touch fittings. Straight (PC) models are ideal for open spaces, while elbow (PL) models allow for compact tube routing along the cylinder body.

  • If rod speed control is needed: You must install SC series speed controllers (flow controls). These allow for precision adjustment of the airflow rate.

3. Select Regulation Type (for SC series)

This is one of the most important technical aspects when working with cylinders:

  • Meter-out (Blue Collet): Regulates air as it exhausts from the cylinder. This is the recommended standard for most applications, as the resulting backpressure (“air cushion”) ensures stable and smooth rod movement.

  • Meter-in (Red Collet): Regulates the incoming flow. This is used less frequently, primarily for single-acting cylinders or specialized control circuits.

4. Match the Tubing Outer Diameter (O.D.)

The fitting must match the diameter of the pneumatic line. Common industrial standards are: 4, 6, 8, 10, and 12 mm.

  • The One-Touch collet mechanism allows for instant tube connection with a single push, providing a secure grip without damaging the tube surface.

5. Consider Operating Conditions and Tubing Material

  • Tubing Material: One-Touch fittings are perfectly compatible with Polyurethane (PU) for flexible connections or Nylon (PA6/PA12) for systems requiring higher pressure and rigidity.

  • Installation Space: If space is extremely limited, choose the Compact One-Touch series, which offers reduced dimensions with the same performance.

  • Rotation: SHPI elbow controllers and fittings feature a swivel design, allowing the tube outlet to be oriented 360° even after the threaded portion has been tightened into the cylinder port.

Quick Order Checklist:

  1. Cylinder port size (e.g., 1/4″).

  2. Is speed control required? (Yes: SC series; No: PC/PL series).

  3. Tubing diameter (e.g., 8 mm).

  4. Control type (for cylinders, Meter-out/Blue is almost always preferred).

Frequently Asked Questions about SC 08-02

What is the difference between SC 08-02 and SC 06-M5?

SC 06-M5 — 6 mm tube, M5 metric thread, small cylinders. SC 08-02 — 8 mm tube, PT 1/4″ BSPT tapered thread, industrial standard for medium and large cylinders.

What is PT 1/4 thread and is PTFE tape required?

PT 1/4″ is tapered BSPT, 1/4 inch nominal diameter — the most common standard in industrial pneumatics. SHPI applies pre-applied PTFE coating at the factory. No tape or sealant needed.

How do I install SC 08-02?

Thread PT 1/4″ with 14 mm wrench (no tape). Rotate body 360° to desired angle. Push 8 mm tube into One-Touch collet until click. Open air and adjust needle.

Can SC 08-02 be used in vacuum systems?

Yes. SC 08-02 supports negative pressure to -750 mmHg. Suitable for suction cup grippers, vacuum forming and other vacuum applications with 8 mm tube and PT 1/4″ port.

Which tubes are compatible?

Any tube with OD of exactly 8 mm: PU polyurethane (flexible), nylon PA6/PA12 (rigid), PTFE (chemically resistant). SHPI 8 mm tubes available at Acvatron.

Characteristics of SC series speed controllers
Model (MODEL)
ØD (mm)
T (Thread)
E
L MAX
A
H (Hex)
SC 04-M3
4
M3xP0.5
24.5
38.5
3.5
8
SC 04-M5
4
M5xP0.8
24.5
37
3.5
8
SC 04-M6
4
M6xP1.0
24.5
39.8
4.8
8
SC 04-01
4
PT 1/8
29.5
41
7.5
12
SC 04-02
4
PT 1/4
33
48.5
11.4
14
SC 06-M5
6
M5xP0.8
26.5
38.5
3.5
8
SC 06-M6
6
M6xP1.0
26.5
39.8
4.8
8
SC 06-01
6
PT 1/8
30
41
7.5
12
SC 06-02
6
PT 1/4
34
48.5
11.4
14
SC 06-03
6
PT 3/8
37.5
54
12.8
19
SC 06-04
6
PT 1/2
45.5
60
15.5
24
SC 08-01
8
PT 1/8
31.5
41
7.5
12
SC 08-02
8
PT 1/4
37.5
48.5
11.4
14
SC 08-03
8
PT 3/8
40
54
12.8
19
SC 08-04
8
PT 1/2
46
60.5
15.5
24
SC 10-01
10
PT 1/8
37
41
7.5
12
SC 10-02
10
PT 1/4
41
48.5
11.4
14
SC 10-03
10
PT 3/8
44
54
12.8
19
SC 10-04
10
PT 1/2
49.5
61.5
15.5
24
SC 12-02
12
PT 1/4
42.5
48.5
11.4
14
SC 12-03
12
PT 3/8
46
54
12.8
19
SC 12-04
12
PT 1/2
50
60
15.5
24
These fittings are designed to work with air under pressure from 0 to 150 PSI and have the ability to rotate the body 360 ° for easy tube connection.
A pre-applied Teflon coating (pre-sealant) on the fitting threads ensures an immediate seal immediately after installation. This eliminates the need for additional sealing materials such as PTFE tape or liquid sealants. Using fittings with a pre-applied protective coating significantly reduces installation time and costs.
This solution guarantees reliable leak protection and prevents system contamination, extending the life of pneumatic components. The coating is applied to all types of PT (BSPT) and NPT male tapered threads. This allows engineers to make quick and clean connections in confined spaces while maintaining the high reliability of the pneumatic line.

Vacuum System Components (Negative Pressure)

Specialized One-Touch series fittings and related components from SHPI are suitable for vacuum systems (negative pressure environments) and are officially certified for such operating conditions.

According to technical specifications, the following types of devices are required for vacuum applications:

1. Primary Fitting Types

Standard and compact push-to-connect (collet) fittings are used for vacuum lines to ensure instantaneous tubing fixation:

  • Standard One-Touch Fittings: Including PC (straight), PL (elbow), PT (tee) series, and others.

  • Compact One-Touch Fittings: Feature reduced dimensions, which is critical for high-density mounting in vacuum equipment.

2. Functional Vacuum Devices

In addition to simple connectors, the following may be utilized in vacuum systems:

  • Speed Controllers: SC series. These allow for flow regulation, which may be necessary for the gradual creation or release of vacuum.

  • Stop Fittings: SPC series. These fittings completely block airflow when the tube is disconnected, helping to maintain the vacuum integrity in the rest of the system.

  • Check Valves: CVPC series. Used to protect the vacuum line and maintain unidirectional flow.

3. Technical Requirements and Specifications

When selecting fittings for vacuum, it is important to consider the following parameters:

  • Maximum Vacuum (Negative Pressure): SHPI fittings are rated for negative pressure up to -29.5 inHg (-750 mmHg / -750 Torr).

  • Airtightness: To prevent air ingress (leakage), fittings are equipped with O-rings or feature pre-applied Teflon coating on the threads.

  • Materials: Nickel-plated brass bodies and polyoxymethylene (POM) collets ensure connection cleanliness and reliability.

Recommended Tubing

For reliable performance in vacuum conditions, it is recommended to use Polyurethane (PU) or Nylon tubing. In particular, SHPI polyurethane spiral hoses are frequently used in vacuum systems due to their wear resistance and elasticity.

Difference Between Meter-out and Meter-in

The difference between Meter-out and Meter-in lies in which specific airflow—entering the device (cylinder) or exiting it—is regulated to control the operating speed.

SHPI SC series speed controllers use a clear color-coding system to identify these types:

1. Meter-out (Exhaust Regulation)

This is the primary and most common method for controlling the speed of pneumatic actuators.

  • Principle: The fitting restricts (throttles) the airflow exiting the cylinder chamber while allowing the incoming flow to pass freely through an integrated check valve.

  • Advantage: By restricting the exhaust air, an “air cushion” (backpressure) is created, ensuring maximum smoothness and stability of the cylinder rod movement, even under fluctuating loads.

  • Catalog Color: These fittings feature a blue plastic release sleeve (collet).

2. Meter-in (Inlet Regulation)

  • Principle: The fitting restricts the airflow entering the cylinder chamber and allows the air to exhaust freely in the opposite direction.

  • Application: Used less frequently, primarily for single-acting cylinders with spring return or in specific circuits where regulating the filling of a volume is required.

  • Disadvantage: May cause intermittent movement (“jerking” or “stick-slip”) of the piston, especially at low speeds.

  • Catalog Color: These fittings feature a red plastic release sleeve (collet).

Comparison of Characteristics

Characteristic Meter-out (Blue) Meter-in (Red)
Regulated Flow Exiting the cylinder Entering the cylinder
Check Valve Free flow into the cylinder Free flow out of the cylinder
Stroke Smoothness High (Recommended) Lower (For specific tasks)
Operating Pressure 0 – 150 PSI 0 – 150 PSI
Адрес:

MD2032, Молдова, Кишинев, ул. Сармизегетуса 12, офис 129

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