Non-rising stem gate: on the cover or on stents stem nut, opening and closing door, rotate the valve stem nut to achieve valve rod. Stem lubrication to, this structure advantage degree of open and close, so it is widely used. Non-rising stem gate valve: the valve stem nut body direct contact with the media. When open and close the door, the rotating valve stem. The advantage of this structure is: the gate height always remains the same, so for large diameter or limiting Industrial Valves installation space small installation space. With this kind of structure to open and close indicator, to indicate the degree of opening and closing. The disadvantage of this structure is: the valve stem threads not only unable to lubrication, and directly to medium erosion, easy to damage. Cast iron non-rising stem gate main difference: 1. Non-rising stem gate valve flange ascending screw rotation is not moving up and down, only naked just a lever, it was fixed to the nut on the door, through the screw, no visible the rotation of the door frame, in order to improve the grid; Non-rising stem flanged gate lifting nut exposure to the handwheel is fixed ( No rotation and axial movement) Upgrade door, wring out of the door to rotate the rotation of the screw is only relative motion without relative axial displacement, a ─ appearance shape bracket. 2 screw non-rising stem gate is invisible, and the next lens is to be able to see the screw. 3. When the switch is connected with the steering wheel is relatively fixed non-rising stem stem, it is through the stem on the fixed point, to drive the valve lift and complete opening and closing of the door. Lift stem valve used in through the screw driver to raise or lower the stem and the steering wheel. Simple point is rising stem valves in a fixed point always attaches great importance to move up and down the stem do together, the steering wheel. Rising stem gate valves work principle, turn the handwheel by hand wheel and screw thread of the valve stem of the advance and retreat, lifting or lowering the valve plate connected with the valve stem, reach the role of opening and closing rising stem gate valve has the following advantages: small fluid resistance, sealing surface of erosion and erosion by the medium. Open and close more effort. Medium flow direction is not restricted, disturbed flow, reduce the pressure. Shorter form, simple structure, good manufacturing technology, wide application scope. The shortcoming of rising stem gate valves are as follows: easy cause erosion and abrasion, surface maintenance more difficult. Dimension is bigger, open needs certain space, open and close time is long. The structure is complex. Gate valve type, according to the sealing surface configuration can be divided into wedge type gate valve and parallel sluice gate valve gate, wedge gate valve gate can be divided into: single gate type, double disc and flexible disc; Parallel slide gate valve can be divided into single ram and double ram. According to the threads of the valve stem position, can be divided into rising stem gate valves and dark bar gate valve two kinds. Rising stem gate valve handwheel installation and maintenance, handle and transmission mechanism are not allowed for lifting, and collision is forbidden. Double disc gate valves should be installed vertically ( The stem in a vertical position, the handwheel at the top) 。 Gate valve with a bypass Industrial Valves in open open the bypass valve should be taken before, To balance the import and export of pressure difference and reduce the opening force) 。 Belt transmission mechanism of the gate, according to the regulations of the product instruction manual installation. If the valve switch is used, often lubrication at least once a month. Rising stem gate valve features: light weight: made from ontology with senior nodular cast iron, compared with traditional gate valves, the weight about 20% ~ 30% reduction in weight, easy installation and maintenance. Flat type brake block: traditional gate often wash the tube in the water after the external objects such as stone, wood, cement, iron filings, sundry sedimentation on the bottom of the valve such as the slots, easy to cause cannot close tightly and form slack phenomenon, at the bottom of the seal of the elastic base seat gate valves with water pipe with flat design, not easy to cause debris deposition, make the flow unimpeded. The overall plastic bags: ram is made of high quality rubber, outsourcing, the whole Europe first-class rubber vulcanization technology make the gate to ensure accurate after vulcanization of geometry size, and rubber and ductile cast gate, then fall off not easily and elastic memory preferred. Water jingzhu valve: the valve body adopts precision casting, precise geometry size inside the body to ensure the valve without the need for any finish sealing.
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