Diaphragm Valves with Flat Seat

We offer high-quality flat-seated diaphragm valves from Crane (Saunders) and Sisto, the leading developers and manufacturers in the field of fluid technology.

Our Saunders and Sisto flat-seated diaphragm valves feature a smooth, turbulence-free valve body design
that ensures unobstructed, straight-through, dead-space-free flow with minimal pressure drop.
They are precise to control, chemically resistant and require low maintenance.
Also, they offer excellent sealing, flexible application options and a robust design that meets even the most demanding requirements.

Even in the field of sterile process engineering, where the highest demands are placed on the materials, design and manufacture of components,
both Saunders and Sisto are leaders in the development and manufacture of high-quality diaphragm valves,
which are mainly used in modern biopharmaceutical process systems.
For example, Saunders manufactures customised Bio-Block valves from solid material that meet even complex requirements.

Our Saunders and Sisto flat-seated diaphragm valves are available in various versions, which can be individually tailored to the respective process requirements.
There are standard and special designs, which are characterised by different diaphragm types, connection types and actuation options
and can be optimally combined as required to implement solutions even for complex systems.

Saunders and Sisto flat-seated diaphragm valves are widely used in industries such as
water and wastewater technology, hygiene and sterile technology, the food and beverage industry, pharmaceuticals and biotechnology, the chemical industry,
pulp and paper production, paint and varnish manufacturing/processing, gypsum, cement, sulphur and lime extraction, electronics manufacturing and many more.
They are ideal for use in hygienic, corrosive or high-pressure environments.

Applications
diaphragm valve with flat seat

constructed for many different applications such as industrial and process technology, particularly suitable for difficult applications in pharmaceuticals, hygiene and sterile technology, semiconductor and microchip manufacturing, water treatment such as wastewater, dirty water, seawater, cooling water and service water as well as ultrapure and pharmaceutical water, sludge, powder and dust, cellulose and paper production/processing, paint and varnish production/processing, mining and assembly technology, ore processing, gemstone, metal and mineral extraction/processing, fertiliser production, gypsum, cement, sulphur and lime extraction, brine technology, sewage treatment plant technology, power plant technology, granulate production, automation technology, food and beverage technology
suitable for various media with high flow rates, particularly suitable for heavily contaminated, highly viscous, crystalline and abrasive media or for applications that require high hygiene standards
robust and reliable even at high pressures and temperatures up to +160°C (depending on material)
operating conditions according to data sheet

Construction
diaphragm valve with flat seat

compact, robust, three-piece design with flat valve seat
low dead space, low maintenance and optimised drainage design with free, unobstructed passage
valve body made of grey cast iron, ductile cast iron, cast steel, red brass or stainless steel, optionally available with coating in a wide variety of materials
iInternal, flexible shut-off diaphragm made of EPDM, CSM, NBR, IIR, FKM, TFM/EPDM 2-piece, TFM/PVDF/EPDM 3-piece, replaceable when the valve is installed if required
valve top with handwheel, electric, pneumatic or hydraulic actuator
highly visible position indicator with integrated spindle protection
optionally available with locking device or sealable cap to prevent unauthorised operation (depending on model)
optionally available with spindle extension
optionally available with positioner

Versions
diaphragm valve with flat seat

Nominal sizes:
DN15-300
Pressure ratings:
PN10-16
Connection types:
flange, thread or welding ends
Bore types:
free
Operation:
available with handwheel, electric or hydraulic drive

Types and features diaphragm valves with flat seat

Saunders diaphragm valve type KB

valve body with flat seat and free bore for straight-line and unobstructed conveyance of high flow rates, including highly abrasive liquids with a solids content of up to 100%
can be installed in any position, including self-draining if required
low dead-space, flow-free, drainage-optimised and extremely robust design with permanent lip lubrication for contamination-free operation, uniform flow characteristics and minimal pressure drop
no cavitation or pressure surges thanks to linear characteristic curve
highly flexible, tight-closing diaphragm for permanent form-fitting shut-off under pressure and vacuum
low-wear operation of the diaphragm thanks to supporting compressor
uncomplicated and easy operation thanks to ergonomically shaped handwheel, clear position indicator and threaded spindle with thread on both sides
easy cleaning
low maintenance
low operating costs thanks to the option of retrofitting a drive without removing the valve from the pipeline
leak-free operation with long service life

Sisto diaphragm valve type KB

Optimised long-term operation
The spindle protection, integrated into the position indicator, prevents contamination from outside.
Reliable operability
The spindle and all internal operating parts are not in contact with the medium.
Smooth operation
The axial bearing minimises the closing torques.
Keeping the flow medium clean
The absence of dead space ensures that the medium remains clean and prevents deposits.
Absolute tightness to the outside and in the passage
The diaphragm seals the valve hermetically to the outside, in the passage and the operating parts.
Quick position control
The valve position is easily recognisable even from a distance thanks to the clear visual display.
Low flow resistance
The housing form with free passage ensures favourable flow conditions.
High corrosion and abrasion resistance
The high-quality coatings offer safety and durability.