ST swing check valve body cover is cast, there are two series of soft seal and hard seal, using the internal rocker arm swing structure, all the opening and closing parts are installed in the body, not through the body, in addition to the flange part with sealing gasket and sealing ring, the overall no leakage point, to eliminate the possibility of valve leakage.The swing check rocker arm and disc are connected with a spherical structure, allowing the disc to have a certain degree of freedom in a 360 degree range, with appropriate micro-position compensation.For higher pressure, larger diameter and medium head of the higher pipeline, can choose the heavy hammer slow closed check valve, it is on the basis of swing check valve, increase the heavy hammer device and hydraulic actuator with oil cylinder, effectively reduce the damage of the water hammer pressure stop pump, delay the closure time of the valve to protect the sealing surface.Used in petroleum, chemical industry, pharmaceutical industry, chemical fertilizer, electric power industry and other working conditions of the pipeline.
Structural features:
1. The valve body cover is cast, and the middle part is connected by bolts and nuts. The wound gasket (made of flexible graphite with stainless steel wire clip) is sealed
2. 900LB, 1500LB and 2500LB pressure self-tightening sealing structure is adopted in the middle cavity, the sealing performance increases with the increase of internal pressure, and the reliability is high
3. Internal rocker arm swing structure is adopted. All opening and closing parts are installed inside the valve body without penetrating the valve body
4, swing check rocker arm and disc connection using spherical connection structure
5. The sealing surface of the valve seat is welded by alloy steel or hard alloy, featuring high temperature resistance, corrosion resistance, abrasion resistance and long service life
6. Various pipe flange standards and flange sealing forms can be adopted to meet various engineering needs and user requirements
7, for higher pressure, larger diameter and medium head of the pipeline, can choose the heavy hammer slow closed check valve, it is on the basis of swing check valve, effectively weaken the damage of water hammer pressure stop pump, delay the disc closing time to protect the sealing surface
Design specification:
Design criteria: API 6D, ASME B16.34, BS 1868, GB/T 12235
Structure length: ASME B16.10, API 6D, GB/T 12221
Connection standard: ASME B16.5, ASME B16.47, ASME B16.25, GB/T 9113, JB/T 79, HG/T 20592
Pressure test: API 598, API 6D, GB/T 13927, GB/T 26480
Pressure and temperature classes: ASME B16.34, GB/T 12224
Performance parameters:
Main material: carbon steel, stainless steel, alloy steel
Nominal size: NPS 2"~NPS48" DN50~DN1200
Pressure range: CL150~CL2500 PN10~PN420
Operating temperature: -196℃~+600℃
Application: applicable to petroleum, chemical, pharmaceutical, chemical fertilizer, power industry, low temperature and other conditions
