Metal seated vs resilient seated gate valves

Gate valves can be divided into hard seal gate valves and soft seal gate valves depending on the seat material; the different seat materials determine the characteristics of the gate valves and the different media and conditions they can be applied, they have their own characteristics and are widely used.

Features of the hard seal gate valve:

(1) High-strength aluminum bronze valve seat.

(2) Metal surfaces machined to a high finish to ensure optimum contact and minimum leakage.

(3)Stainless steel stem.

(4)Four independent stem sealing systems DN350-600.

(5)DN≥700 Sufficient depth of stuffing box to effectively extend the service life of PTFE.

(6)Rounded bonnet gasket is placed in a recess in the bonnet to prevent blow-out due to sudden rise in water pressure.

(7) Full bore.

(8)Easy operation of the lifting ring, facilitating easy and safe vertical and horizontal movement.

(9) All rubber and coatings in contact with water are certified for potable water.

(10) The guide wedge protects the rubber from frictional damage caused during operation.

(11)DN350-600 Protective fasteners made of 8.8 galvanized steel, exposed fasteners made of A4 stainless steel.

(12) DN≥700 Fasteners made of 8.8 galvanized steel.

(13)DN350-1000 Protected by 250 epoxy resin fused blue coating.

(14)DN≥1100 Protected by 250 x m blue double-wrapped epoxy coating.

(15)Optional bypass is available.

The hard seal range of gate valves is designed with attention to every detail and features a built-in safety system.

The valve flaps are fully encapsulated and integrally vulcanized with wesdom's own EPDM synthetic rubber, certified by WRAS for drinking water. These features give the valve excellent durability due to the rubber's compression resilience, the double-bonded vulcanization process, and the sturdy valve design. A quadruple-safe stem sealing system, an ultra-high-strength stem, and comprehensive corrosion protection all ensure the valve's unrivaled reliability.

Features of the soft seal gate valve:

(1) Fixed integral flap nut with anti-vibration feature ensures long-lasting durability of the valve

(2) Nylon guide wedge protects the rubber from frictional damage caused during operation and enhances rubber wear resistance

(3) Stainless steel stem with stop ring and cold-pressed threads

(4) The gate has a large through-hole and as the core is not hollow, water or impurities cannot collect and cause contamination

(5) Triple secure stem sealing system consisting of an NBR dust ring, two NBR O-ring protection, and two EPDM main seal gaskets

(6) PTFE-coated circular stainless steel thrust ring provides low operating torque for the valve

(7) Removable gland flange for in-line replacement of the spool sealing system in case of insufficient pressure

(8) A round rubber cap gasket is placed in the recess of the cap to prevent wash-out due to pressure surges

(9) Stainless steel bonnet countersunk bolts surrounded by the bonnet gasket and sealed with hot melt adhesive

(10) ISO top flange, recommended for electric actuators or gearboxes.

(11)Suspension ring facilitates easy and safe vertical and horizontal movement

(12) Epoxy resin coating in accordance with DIN 30677-2, certified by GSK

(13) All rubber parts are DVGW and WRAS approved

(14)Can be installed horizontally or vertically

(15) Removable flushing end caps for easy flushing of the valve flap and the inside of the valve body when required

(16) Bypass valve

Wesdom gate valves are designed with attention to every detail and have a built-in safety system.

The valve flaps are made of fully vulcanized EPDM rubber, developed and produced in-house by wisdom, and certified for drinking water. These characteristics give the valve long-lasting durability due to the rubber's compression resilience, the double-bonded vulcanization process, and the robust valve design. The triple-safe stem sealing system, the ultra-high strength stem and the comprehensive corrosion protection ensures unparalleled reliability.