What is non-Slam valve?

What is non-Slam valve?

A non-slam check valve does not. It utilizes a coiled spring, downstream from the valve disk, that moves the disk toward the seat as soon as the flow velocity slows down. This valve is designed to be closed, just before zero flow is reached, thereby eliminating backflow.

What is the characteristics of check valve?

the disc should have low inertia and friction, ● the travel of the disc should be short, or ● the motion should be assisted with springs. To close slowly, a check valve needs to be equipped with external devices such as oil dashpots and the pump must be capable of withstanding some backspin.

Is dual plate check valve Non-slam type?

The Dual Plate Check Valve design is classified as “Non-Slam Design”. The disc in a swing check valve is hinged at the top. As the flow reduces, the closure of disc is influenced by force of gravity and high inertia of the heavy disc. This momentum can cause severe damage when the disc slams on to the valve seat.

What is api594?

API Std 594, Check Valves: Flanged, Lug, Wafer, and Butt-welding, is a standard developed and published by the American Petroleum Institute (API) that covers the design, materials, face-to-face dimensions, pressure-temperature ratings, and examination, inspection, and testing requirements for Type “A” and Type “B” …

What is non Slam?

The non slam check valve refers to the automatic opening and closing valve disc that rely on the flow of the medium itself, which is used to lower the noise when open or close, also known as nozzle check valve. The non slam check valve belongs to an automatic valve.

What is a non-return check valve?

A check valve is the simplest type of directional control valve used in hydraulic systems. Check valves stop the flow of fluid in one direction and allow free flow in the opposite direction. They are also known as non-return valves. This is called a line rupture valve.

What is a non-return valve used for?

A non-return valve allows a medium to flow in only one direction and is fitted to ensure that the medium flows through a pipe in the right direction, where pressure conditions may otherwise cause reversed flow.

What is an API valve?

An overview of the American Petroleum Institute – API – valve standards. Describes methods of determining the seat tightness of metal- and soft-seated pressure relief valves, including those of conventional, bellows, and pilot-operated designs.

What is a water arrestor?

Water hammer arrestors are used to absorb the shock when water flowing in a piping system suddenly stops due to fast closing shutoff valves, dishwashers, and clothes washers. This action protects against annoying and potentially damaging effects of water hammer.

Are there any non-slam check valves that work?

DFT® Inc. offers a wide range of reliable check valves specially designed to accommodate diverse applications across every industry. To learn more about your options for preventing water hammer with non-slam check valves, check out DFT® Inc.’s comprehensive check valve literature library.

Why does a non-slam check close faster than a swing check?

This occurs because a swing check largely depends on back flow for it to close. A non-slam check valve does not. It utilizes a coiled spring, downstream from the valve disk, that moves the disk toward the seat as soon as the flow velocity slows down.

What do you call a swing check valve?

Often called flapper style check valves, swing check valves are a more traditional variety. The disc of a swing check valve is secured to the body of the valve by a trunnion and hinge arm, without the aid of a spring.