Flat gate valves are used in natural gas, petroleum, chemical, environmental protection, urban pipelines, gas pipelines and other transportation pipelines, emptying systems and steam storage devices, as headstock equipment. Z43 type single gate plate gate valve with diversion hole is suitable for long distance pipeline of natural gas exploitation and purification.

Structural description of Flat gate valve

1, the valve body has two kinds of forms, general nominal pressure ≤2.5MPa, or ≤300lb for casting flat structure, >2.5MPa or >300lb when casting round body structure.

2. The seat is a rigid floating seat inlaid with PTFE or filled PTFE seal ring, with double sealing effect, the valve seat by the end of the 0-type ring to tighten force, and by the piston effect of floating seat to achieve import and export at the same time seal, this double sealing structure to the valve body cavity and channel completely isolated, can be repaired in the working state of the valve, Remove residues from body cavities.

3, the gate plate is a rectangular parallel plate, which opens a pass hole with the same diameter as the channel (with diversion hole), also does not open the hole (without the diversion hole), the entire opening, the channel smooth is the straight pipe segment, the flow resistance coefficient is low, the pressure loss is small, opens and closes when the gate and the valve seat always mutually touches, can wipe the particulate dirt which attaches in the seal pair, The sealing surface can be protected by the direct erosion of the medium.

Features of flat Gate valves:

1. VALVE SEAT sealing structure should be elastic with preload, upstream and downstream sealing block at the same time the structure of sealing. The valve seat and the sealing material are always sealed between the face.

2. The seat has self-cleaning function and is not directly washed by airflow during valve opening or closing. The seat shall be made of a lubricating, not worn material.

3. Valve actuator failure will not affect other parts of the valve, maintenance and replacement work can be carried out without removing the valve.

(1) Yoke bushing – aluminum bronze yoke bushing with pin-type thrust bearings, minimizes operating torque.

(2) Stem – threaded length until bracket, pin and spot welding;

(3) Pressure seals – simple structure, configuration of segmented buckle rings and silver plated low carbon steel washers, which help dismantle and implement the best bonnet seals.

(4) Seat ring – the weld seat ring is perpendicular to the flow channel and is easy to maintain.

(5) Implementing Agencies – these valves can be configured with electric, hydraulic or pneumatic actuators. DN300 the following configuration standard hand wheel, DN350 above configuration helical gear operation mechanism.

(6) Yoke-Fully assembled yoke through seismic testing, easy to maintain and install the Executive Body.

(7) Gland-two-piece, self-adjusting gland, avoid being ejected.

(8) Overall rear seat – hard hard, longest service life.

(9) Disc-the spring-loaded disc can be adjusted to reduce the torque requirement of actuator.

(10) Overall stop-integral casting bracket stop device, positioning the assembled bay disc, make the seat more stable and reliable.

The valve body has two kinds of casting and welding structure.

The valve seat adopts the O-ring seal and the floating seat structure exerting pretension force to make the valve import and export two-way seal; and the opening and closing torque of the structure is only 1/2 of the ordinary valve, and can be easily opened and closed valve.

Metal seals of the valve, the valve body is equipped with grease structure, grease through the grease, valve seat into the valve sealing surface, so that the valve up to 0 leakage.

The valve seat is inlaid with PTFE on the sealing surface, with PTFE sealing the metal and metal to the metal, and the PTFE sealing surface clears the brake plate dirt.

Gate, valve seat by special process treatment, spray welding cemented carbide, wear-resistant PTFE, achieve double seal. and grease auxiliary seal double protection, more reliable seal, longer service life.

The gate with the guide hole valve, whether it is fully open or full closed with the seal surface, the sealing surface is protected from the medium direct scouring, thus prolonging the service life.

When the valve is fully open, the channel smooth to straight line, the flow resistance coefficient is very small, without pressure loss, can pass the wool ball to sweep the pipeline.

The plate gate valve adopts the packing structure with self sealing ability, need not adjust frequently, open, close is very light, and seal is reliable, the stuffing function is equipped with auxiliary seal grease inject structure, the sealing performance is absolutely reliable, truly achieves 0 leaks;

When the valve is closed, the inner cavity high pressure can be unloaded automatically (see Working schematic diagram) to ensure the use of safety.

Fully closed structure, good protection performance, can adapt to all-weather requirements.

The valve is provided with an indicator bar or an observation window to indicate the opening and closing of the valve.