Summary of Product Characteristics

Pneumatic discharge valve is installed at the bottom of vessel, reaction kettle and storage tank. It is used for sampling, 
material layout, material feeding and turning off without dead zone. It simultaneously removes residues at the bottom 
of the container. Disc consists of uplifting&dropping type which means upward type&downward type. The difference 
is that the disc of upward type goes upward to discharge material and downward type goes down to discharge material. 
It can also be customized plunger type structure according to working condition requirements. Pneumatic discharge 
valve is widely used in high viscosity liquid containing fiber fluid, easily crystallized fluid, sedimentary fluid, particle 
fluid and so on. It’s specially used for discharging material at the bottom of storage tank and reaction kettle. That´s why 
it´s also named bottom kettle valve.
Typical Characteristics:
01. Inverted installation, approximately linear flow channel, small flow resistance, no dead angle, small pressure drop loss
02. Sealing surface is overlaying stellite alloy. It´s wear-resisting, corrosion-resisting and high temp. resisting, 
      suitable for high temperature and containing solid particle medium and other harsh environment 
03. The sealing surface after precision machining, leakage level Ⅳ or above, soft sealing can reach zero leakage
04. According to the need, optional diaphragm type, piston type pneumatic actuator and stroke switch, etc.
05. Applicable temp.: Normal Ib: -29～150℃, special Ia: -29～250℃, Ⅲa: -29～350℃, Ⅲb: -29～450℃, Ⅳa: -29～595℃
06. Valve disc sealing material: Carbon steel normal alloy steel, stainless steel normal body material, special PTFE, PPL,
       hard alloy
07. Valve body material: Cast steel WCB (code: C), SS304 (code: B), SS316 (code: R), SS316L (code: L), chrome-
      molybdenum steel (code: I)

Structure Diagram 

Brief Instruction of Order Model

Note: For details, please refer to the model code instruction of control valve type direct strokeautomatic control valve on P003 of this

          manual.

Main Valve Core Structure Form 

Main Technical Parameters

External Dimension

Notes:

1. Inlet flange of normal downward pneumatic discharge valve is bigger than the size of outlet flange, the size of inlet and outlet flange of upward pneumatic discharge valve are the same, inlet matching flange has been equipped before leaving the factory.
2. The data in the table above is external dimension of pneumatic piston discharge valve with PN16bar, the height H of pneumatic diaphragm discharge valve is that the data above minus 40, other sizes are the same as the dimension in the table above.
3. The flange is made according to JB/T79-1994, can also be customized, such as: GB/T9124, HG/T20592, ANSI, JIS, DIN, etc.        

Q81 Q82 Q83 Pneumatic Diaphragm Type / Q51 Q52 Q53 Pneumatic Piston Discharge Valve

Product Overview

BEST AUTOVALVE Q Series Pneumatic Discharge Valves are designed for installation at the bottom of vessels, reaction kettles and storage tanks. They are used for sampling, material discharge, feeding and shut-off operations without dead zones, while helping remove residual material from the bottom of the container.

The series is available with pneumatic diaphragm actuators and pneumatic piston actuators. Depending on the required operating conditions, the valve can be configured with an upward-opening disc, downward-opening disc or plunger-type structure.

These valves are suitable for handling high-viscosity liquids, fiber-containing fluids, easily crystallized fluids, sedimentary fluids and particle-containing media. They are particularly suitable for bottom discharge applications in storage tanks and reaction kettles.

Product Series and Model Options

The Q Series includes six main configurations:

The upward-opening and downward-opening designs differ in the direction of disc movement during valve opening. A plunger-type structure is also available for operating conditions requiring movement of the plunger within the valve body to clean the inner cavity.

Key Features

• Bottom Discharge Design: Installed at the bottom of vessels, reaction kettles and storage tanks for material discharge and residual removal.

• Dead-Zone-Free Structure: The inverted installation arrangement and approximately linear flow passage help reduce dead zones, flow resistance and pressure-drop losses.

• Wear-Resistant Sealing Surface: The sealing surface is overlaid with Stellite alloy for wear resistance, corrosion resistance and high-temperature performance.

• Suitable for Challenging Media: Designed for applications involving high-viscosity liquids, fiber-containing fluids, crystallizing media, sedimentary fluids and particle-containing fluids.

• Multiple Disc Configurations: Upward-opening, downward-opening and plunger-type structures are available to suit different process requirements.

• Flexible Actuator Options: Pneumatic diaphragm and pneumatic piston actuator configurations are available.

• Soft or Hard Sealing: Valve disc sealing materials can be selected according to operating conditions.

• Optional Accessories: Stroke switches and other configurations can be specified according to application requirements.

Valve Structure Options

Upward-Opening Type

The disc moves toward the inside of the reaction kettle when the valve opens. This design is suitable for discharging accumulated material at the bottom of the reaction kettle.

Downward-Opening Type

The disc moves toward the inside of the valve body when the valve opens. The manual notes that this configuration is easy to close when a vacuum exists in the reaction kettle, helping prevent backflow.

Plunger Type

The plunger moves within the valve body, helping clean the inner cavity during operation. This configuration is suitable for slurry-type media.

Valve Body Materials

The Q Series provides the following valve body material options:

Sealing Materials

The valve disc sealing material options include:

• Normal alloy steel for carbon steel configurations.

• Normal stainless steel for stainless steel body configurations.

• Special PTFE.

• Special PPL.

• Hard alloy.

The sealing surface is overlaid with Stellite alloy. According to the manual, the hard-sealing configuration provides leakage Class IV, while soft sealing can reach leakage Class VI.

Technical Specifications

Flow Capacity by Nominal Size

Actuator Options

The manual specifies the following actuator models:

Air supply connections are normally G3/8", with G1/4" and G1/2" available as special options.

• Diaphragm actuator air supply pressure: 200–400 kPa.

• Piston actuator air supply pressure: 400–600 kPa.

The valve can be configured with normally closed action and optional solenoid valves and stroke switches. Explosion-proof accessories are also available.

Temperature Options

The manual lists the following operating temperature configurations:

• Normal type: -29°C to 150°C.

• Special type: -29°C to 250°C.

• Heat-dissipation type: -29°C to 350°C for carbon steel configurations.

• Heat-dissipation type: -29°C to 450°C for stainless steel configurations.

• High-temperature type: -29°C to 595°C.

For soft-sealing configurations, the manual specifies -29°C to 150°C for PTFE sealing and -29°C to 250°C for PPL sealing. Final temperature suitability depends on the selected body and sealing materials.

Applications

BEST AUTOVALVE Q Series Pneumatic Discharge Valves are suitable for:

• Chemical reaction kettles.

• Storage tanks and vessel-bottom discharge systems.

• High-viscosity liquid handling.

• Fiber-containing fluid applications.

• Crystallizing and sedimentary media.

• Particle-containing fluids and slurry applications.

• Industrial material sampling, feeding and discharge systems.

Connection and Installation

The standard connection is flange type. The manual specifies JB/T79-1994 as the standard flange reference. Other flange standards can be customized, including GB/T9124, HG/T20592, ANSI, JIS and DIN.

For the downward-opening pneumatic piston discharge valve, the inlet flange is larger than the outlet flange. For the upward-opening pneumatic piston discharge valve, the inlet and outlet flanges are the same size, and the inlet matching flange is supplied before delivery.

Warranty

BEST AUTOVALVE provides a one-year warranty under the technical conditions specified in the instruction manual, effective from delivery. Faults caused by user operation or installation are excluded from warranty coverage; assistance is available to help resolve such issues.