Main criteria: 1. Design standard: GB/T 12235 2. Connection standard: 1) Butt welding end BW: according to GB/T 12224 2) Flange end RF: according to JB79; GB/T 9113; HG20592 3. Valve inspection and test: GB/T 13927; JB/T 9092 Adopt the following structure: Detailed introduction: The opening and closing member of the shut-off valve is a cylindrical valve flap having a flat or tapered surface, and the valve flap moves linearly along the center line of the fluid. The movement form of the valve stem has a lifting rod type (the valve stem is lifted and lowered, the hand wheel does not move up and down), and there is also a lifting rotary rod type (the hand wheel and the valve stem rotate together and the nut is set on the valve body). The shut-off valve is only suitable for full opening and full closing, allowing adjustment and throttling when customized. When the shut-off valve is opened, the opening height of the valve flap is 25% to 30% of the nominal diameter, and the flow rate has reached a large value, indicating that the valve has reached the fully open position. Therefore, the full open position of the shutoff valve should be determined by the stroke of the valve flap. Op seeds, heat and dry resistant Coriander Seeds, grow very fast, bright green leaf, light green petiole, up-right, great flavor, easy planting and wide adaptability, suit for growing in warmer weather, best grow temperature is 15 to 30 degree. Coriander Seeds Coriander Seeds,Organic Coriander Seeds,Dried Coriander Seeds,Raw Material Spice Coriander Seed Ningxia Zhongqing Agricultural Technology Co. Ltd. , https://www.zq-vegetableseeds.com
Open rod bracket bolt connection valve cover; internal pressure self-tightening valve cover integral upper seal seat
Purity ≥85.0%
Neatness ≥70.0%
Germination percentage ≥85.0%
Moisture ≤10.0%
Origin Ningxia, China
Sowing dosage: 1kg to 1.5kg per 667m2.
PH VALUE: Not special request
How the shut-off valve works
For example, suppose a water tank with a lid, water enters from the bottom of the cylinder, and flows out from the cylinder mouth. The cylinder head is equivalent to the closing part of the valve. If the cylinder head is lifted up by hand, it is equivalent to the working principle of the shut-off valve. If the cylinder head is removed by hand, it is equivalent to the working principle of the gate valve.