气动内螺纹三通球阀Q614F/Q615F

Stem Sealing with Anti-Blowout Design

The valve stem adopts a blowout-proof sealing system with a two-stage sealing mechanism:

Primary Sealing

A tapered stem cooperates with a tapered stem seal to effectively prevent medium leakage during stem rotation.

Even under abnormal pressure surges, the sealing remains reliable.

Secondary Sealing

A set of V-shaped packing rings expands outward when compressed, forming an additional leak-proof barrier.

Automatic Wear Compensation

A Belleville spring provides preload compression, automatically compensating for wear in the packing and stem seal.

Secure Sealing System

The stem nut compresses the entire sealing assembly to prevent leakage.

A lock washer secures the stem nut to prevent loosening.

Pneumatic Internal Thread Three-Way Ball Valve Q614F/Q615F

Overview

The pneumatic internal thread (butt-weld) three-way ball valve consists of a double/single-acting pneumatic piston actuator and an internal thread (butt-weld) ball valve.

Key Features:

Valve Body Options: One-piece, two-piece, or three-piece construction.

Elastic Seat Seal: Ensures reliable sealing and smooth operation.

Bottom-Mounted Stem with Backseat Seal: Prevents stem ejection under abnormal cavity pressure.

Low-Friction Actuator:

Bearing sleeve made of low-friction material.

Hard anodized cylinder surfaces for corrosion resistance and extended service life.

Stable Performance: Widely used in petrochemical, metallurgy, power, light industry, and pharmaceutical sectors.

Working Principle

When the pneumatic actuator is connected to the power supply and air source, air enters cylinder A (or B) through pipeline A/B, driving the piston to rotate the shaft and ball by 90°.

Visual Indicators:

Top-mounted position indicator: Green mark ("OPEN") shows valve is open.

Limit switch signal:

Green light = Open

Red light = Closed

Positioner: Adjusts flow rate in the pipeline.

Note: This design ensures high sealing reliability, blowout-proof safety, and long-term durability under demanding industrial conditions.

Flow Direction Principles of Three-Way Ball Valves

Three-way ball valves are classified into L-type and T-type, with distinct flow path configurations (see diagram below).

L-Type Three-Way Ball Valve

Designed for flow direction switching.

Connects two perpendicular pipelines while blocking the third.

Typical applications: diverting flow between two alternate paths.

T-Type Three-Way Ball Valve

Suitable for flow splitting, merging, or directional switching.

The T-shaped bore allows:

All three ports to interconnect (full flow distribution).

Any two ports to connect while isolating the third.

Standard design: Dual-seat structure (optional four-seat configuration upon request).

Pneumatic Internal Thread Three-Way Ball Valve Q614F/Q615F (Figure 7)

Optional Accessories

1. On/Off Control Accessories:

Single solenoid valve

Double solenoid valve

Limit switch with position transmitter

2. Flow Regulation Accessories:

Electric positioner

Pneumatic positioner

Electro-pneumatic converter

3. Air Supply Treatment Accessories:

Air filter regulator

Air supply triplet unit (filter + regulator + lubricator)

4. Manual Override:

Handwheel or lever actuator

Note: The L/T-type selection depends on flow distribution requirements, while accessories enhance automation, control precision, and operational flexibility.