Products Description
A spring-loaded safety valve is a valve that relies on the elastic pressure of the spring to lock the valve diaphragm or plunger and other seals. Once the pressure of the pressure vessel is abnormal, the high pressure generated will overcome the spring pressure of the safety valve, so the locking device is pushed open, forming a pressure relief channel to release the high pressure. According to the different opening heights of the valve disc, it is divided into full-lift type and micro-lift type. The full-lift type has a large discharge volume and good resilience, and is suitable for liquid and gas media. The micro-lift type is only suitable for liquid media.
Applicable conditions:
(1) Suitable for cutting off or connecting liquid or gas pipelines in the working temperature range of -40°C to +200°C. When used to cut off flammable gases, a safety explosion vent with a flameout protection device should be selected.
(2) This type of equipment should be installed in a well-ventilated place and installed upright. There should be no corrosive substances around it. If installed outdoors, rain protection facilities should be set up.
(3) The nominal diameter of this type of equipment is consistent with the nominal diameter of the pipeline. However, it should not be less than 1.5 times the diameter of the pipeline (i.e. DN≤150mm).
(4) The nominal diameter of this type of equipment is the same as the nominal diameter of the pipeline, but its size shall not exceed one-third of the outer diameter of the pipeline (i.e. Dn≤1200mm).
Product Features
● The spring-loaded safety valve reduces the point of action of the valve stem force and improves the sealing performance. The valve stem force action point of the ordinary flat disc is not only higher than the sealing surface, but also does not act directly on the disc. For valves with flexible discs, the valve stem force action point is reduced to below the sealing surface and acts directly on the disc. This structural improvement greatly improves the valve's anti-vibration ability, that is, the sealing stability is greatly improved. In other words, when the valve has the same degree of vibration, the flexible disc valve is less likely to leak. This performance has been verified in the actual operation of the spring-loaded safety valve.
● The "flexible disc" structure not only improves the operating sealing performance, but also increases the operating pressure value to maintain sealing. For the design of ordinary flat discs, when the operating pressure rises to the valve set pressure (i.e. 95% of the set pressure), the valve will have "pre-leakage". For spring-loaded safety valves, the existence of "pre-leakage" is a normal phenomenon, and the existence of "pre-leakage" can help the spring-loaded safety valve to jump to a certain extent. Therefore, Crosby Company sets the difference between the design pressure and the maximum operating pressure of the spring-loaded safety valve to more than 5%.
● The "flexible valve disc" structure introduces the system pressure into the annular groove on the back side of the valve disc sealing surface and acts on the annular inclined surface opposite to the valve disc sealing surface. Since the sealing surface has a certain elasticity, as the medium pressure in the system increases, the valve disc sealing surface is pushed downward by the system pressure to produce a slight deformation and tightly combine with the nozzle sealing surface, thereby delaying the valve pre-discharge point.
Product Specification
| Body material | Stainless Steel |
| Size | DN15~80mm |
| Temperature of Media | less than 200℃ |
| test | 100% leaking test |
| Media | Steam, Water, Gas |
| Pressure | PN16~PN40 |
Product Dimensions
Product Features
● The spring-loaded safety valve reduces the point of action of the valve stem force and improves the sealing performance. The valve stem force action point of the ordinary flat disc is not only higher than the sealing surface, but also does not act directly on the disc. For valves with flexible discs, the valve stem force action point is reduced to below the sealing surface and acts directly on the disc. This structural improvement greatly improves the valve's anti-vibration ability, that is, the sealing stability is greatly improved. In other words, when the valve has the same degree of vibration, the flexible disc valve is less likely to leak. This performance has been verified in the actual operation of the spring-loaded safety valve.
● The "flexible disc" structure not only improves the operating sealing performance, but also increases the operating pressure value to maintain sealing. For the design of ordinary flat discs, when the operating pressure rises to the valve set pressure (i.e. 95% of the set pressure), the valve will have "pre-leakage". For spring-loaded safety valves, the existence of "pre-leakage" is a normal phenomenon, and the existence of "pre-leakage" can help the spring-loaded safety valve to jump to a certain extent. Therefore, Crosby Company sets the difference between the design pressure and the maximum operating pressure of the spring-loaded safety valve to more than 5%.
● The "flexible valve disc" structure introduces the system pressure into the annular groove on the back side of the valve disc sealing surface and acts on the annular inclined surface opposite to the valve disc sealing surface. Since the sealing surface has a certain elasticity, as the medium pressure in the system increases, the valve disc sealing surface is pushed downward by the system pressure to produce a slight deformation and tightly combine with the nozzle sealing surface, thereby delaying the valve pre-discharge point.
Product Dimensions
Product Specification
| Body material | Stainless Steel |
| Size | DN15~80mm |
| Temperature of Media | less than 200℃ |
| test | 100% leaking test |
| Media | Steam, Water, Gas |
| Pressure | PN16~PN40 |
