DINKONDA GLOBAL Power Plants Special A47H-16Q Series QT400 Ductile Iron Valve

Product Specification

DINKONDA GLOBAL Power Plants Special A47H-16Q Series QT400 Ductile Iron Valve Body, Stainless Steel Sealing Spring Micro Opening Safety Valve With Wrench

Product Overview
A47H-16Q belongs to the spring micro opening wrench safety valve, with a valve body material of QT400 ductile iron and a nominal pressure of PN16. Relying on the balance between medium pressure and spring preload force to achieve opening and closing, when the system pressure exceeds the set pressure, the valve disc opens slightly to discharge the medium and relieve pressure; The pressure drops back to the safe value and automatically shuts off. Equipped with a manual lifting wrench, it can test the valve disc action on site. It is mainly used for overpressure protection of liquid/gas pressure equipment pipelines such as water and compressed air, and is commonly used in boilers, pressure vessels, and heat exchange equipment.

Structural Composition
1. The whole machine consists of a valve body, a valve seat, a valve disc, a valve stem, a spring component, a valve cover, an adjusting screw, a wrench component, and a flange sealing pair

2. Valve body: QT400 ductile iron, high toughness, impact resistance, not easily brittle, and better seismic performance than ordinary gray cast iron;

3. Sealing surface: H-shaped stainless steel sealing pair, wear-resistant, corrosion-resistant, stable sealing performance;

4. Spring: High strength alloy spring, anti fatigue, stable setting pressure accuracy;

5. External manual wrench: can manually pull the valve disc online, and regularly inspect whether the valve is stuck or adhered;

6. Flange connection structure, inlet and outlet flanges facilitate docking and installation with pipelines and pressure vessels.

Core Features
1. Micro opening structure: After jumping, the valve flap opens at a small height, suitable for liquid media, with a relatively moderate displacement and sensitive opening and closing;

2. Equipped with a manual lifting wrench, the valve disc action can be verified online to prevent the valve disc from sticking due to long-term static placement;

3. QT400 ductile iron valve body, pressure stable, anti vibration, suitable for water and air working conditions;

4. Stainless steel sealing surface, resistant to medium erosion, rust resistance, and reliable sealing;

5. The upper adjustment screw can fine tune the set pressure within the calibration range;

6. Stable opening and closing pressure difference, good reseating performance, and low leakage after closing;

7. Compliant with special equipment safety valve specifications, used for safety protection of pressure vessels and pressure pipelines.

Technical Specifications
Model: A47H-16Q
Nominal pressure: PN16
Valve body material: QT400 ductile iron
Sealing surface: stainless steel (H)
Applicable media: water, compressed air, etc
Medium temperature: ≤ 200 ℃
Connection method: flange connection
Set pressure range: 0.1~1.6MPa
Structural form: Spring micro opening type, with wrench

Application
Industrial boiler water supply system, hot water boiler;
Heat exchange station, heat exchanger, pressure vessel, expansion tank;
Water supply and circulating water pipelines, air compressor storage tanks;
Overpressure protection for water and compressed air pressure equipment in light industry, HVAC, power plants, etc.

Installation And Usage Precautions
1. The safety valve must be installed vertically upwards and must not be tilted or inverted;

2. The inlet pipeline is short and straight, and it is strictly prohibited to install shut-off valves in the inlet pipeline; Lead the outlet pipeline to a safe location;

3. Regularly calibrate the set pressure according to special equipment specifications, and only after passing the calibration can it be put into use;

4. The wrench is only used for regular testing of take-off movements and cannot be used as a routine pressure relief operation;

5. Prevent impurities from entering the valve chamber and scratching the sealing surface. In case of internal leakage, timely maintenance is required;
Without permission, it is strictly prohibited to rotate the adjusting screw or change the set pressure arbitrarily.