DINKONDA GLOBAL Power Plants Special A42Y/H-16Q Series DN25-DN200, QT400 Ductile Iron Material PN16, Spring Fully Open Closed Safety Valve

DINKONDA GLOBAL Power Plants Special A42Y/H-16Q Series DN25-DN200, QT400 Ductile Iron Material PN16, Spring Fully Open Closed Safety Valve

Product Overview
A42Y/H-16Q is a spring fully open closed safety valve, with a valve body made of QT400 ductile iron and a nominal pressure of PN16. The valve does not have an external wrench and adopts a closed valve cover structure; When the pressure of the medium inside the container or pipeline exceeds the set pressure, the valve disc quickly opens and the medium is discharged to relieve pressure; When the pressure drops to the safe reseating pressure, it automatically shuts off, effectively protecting the pressure bearing equipment. It is suitable for media such as air, steam, and gas, and is often used in working conditions that do not allow the media to spread outwards and pollute the site.

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

2. Valve body: QT400 ductile iron, high strength, good toughness, impact resistance and not easily brittle fracture;

3. Sealing surface: A42Y adopts welded hard alloy, A42H is stainless steel sealing surface, resistant to erosion and high temperature;

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

5. Closed valve cover: a wrench free closed structure that prevents medium leakage and diffusion, protecting the internal spring from environmental erosion;

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

Core Features
1. Fully open structure: At the moment of takeoff, the valve disc is fully opened, with a large discharge capacity and a rapid response to overpressure relief;

2. Closed valve cover, the discharge medium is completely exported from the outlet side without leaking to the outside of the valve cover, suitable for toxic, flammable, explosive, and odorous media;

3. QT400 ductile iron valve body, with better seismic performance than ordinary gray cast iron, suitable for steam and compressed air working conditions;

4. The sealing surface is welded with hard alloy, which is resistant to erosion, reliable in sealing, and has a long opening and closing cycle life;

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 the safety technical specifications for pressure vessels, it can be used for safety protection of boilers, gas storage tanks, and pressure pipelines.

Technical Specifications
Model: A42Y/H-16Q
Nominal pressure: PN16
Valve body material: QT400 ductile iron
Sealing surface: A42Y hard alloy; A42H stainless steel
Applicable media: air, saturated steam, inert gas, etc
Medium temperature: ≤ 350 ℃
Connection method: flange connection
Set pressure range: 0.1~1.6MPa
Structural form: Spring fully open, closed (without wrench)

Application
Overpressure protection for gas storage tanks, pressure vessels, and distribution cylinders;
Thermal exchange stations, industrial boiler steam systems;
Gas pressure equipment for chemical, light industry, and power plants;
Compressed air pipeline network and air compressor matching for safe pressure relief.

Installation And Usage Precautions
1. The safety valve must be installed vertically upwards, and it is strictly prohibited to tilt or invert it;

2. The inlet pipeline is short and straight, and it is not allowed to install shut-off valves; The export pipeline is separately led to a safe area;

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

4. Regularly inspect to prevent impurities from entering the valve chamber and scratching the sealing surface, and promptly repair any internal leaks;

5. Unauthorized rotation of the adjusting screw and arbitrary changes to the set pressure are strictly prohibited;

6. This model does not have a manual wrench and cannot be manually pulled online for testing. It relies on regular calibration to verify the reliability of the action.