Abstract:
A louvre-type airflow regulator (10) for a mine passage comprises a plurality of louvre blades (12, 14, 16). Each blade is adapted for mounting in a frame (20). Each blade can pivot in the frame around a lengthwise axis between a predetermined position in which the louvre blades combine to close or restrict at least a portion of the passage, and an open position in which air is able to readily flow between the louvre blades and through the passage. A biasing mechanism is provided for acting on each louvre blade such that, in use, each louvre blade can be maintained in the predetermined position until a predetermined airflow against the louvre blades is reached.
Abstract:
A ventilator (12) includes a pressure control flap (58) positioned in a horizontal duct portion (56) thereof. The flap (58) is positioned horizontally in an open position thereof and is adapted to pivot against its weight and then against spring means when increasing airflow passes through the flap. A manually operated closure member (88) is also provided.
Abstract:
A sanitary waste pipe system 1 and a sanitary waste pipe venting valve 13 comprises a valve pipe section 13 with a valve body 7 and a valve control 8, 5 member being adapted for allowing the valve body 7 to move from its closed position to an open position when the pressure in said first end of the valve pipe section 13 is either lower or higher than the pressure in said second end of the valve pipe section 13.
Abstract:
A damper is provided for an airflow duct, comprising: a tubular housing, having a first end and a second end, forming a passageway through said housing along a longitudinal first axis (z), said first end further comprising a flange extending radially inward from said first end, and a damper element, linearly moveable along said first axis (z) between a first position, where said damper element sealingly engages with said flange, and a second position, where said damper element is spaced apart from and closingly oriented within said passageway in a plane substantially parallel to said flange. The damper element is pivotably movable about a central second axis (x) that is perpendicular to said first axis (z), between said second position and a third position, where said damper element is openly oriented so as to permit fluid flow through said passageway. The damper comprises an actuator, operatively coupled to said damper element, comprising an axle, arranged coaxially with and pivotably movable about said second axis (x) within said passageway, at least one first biasing member, adapted to urge said damper element towards said second position, when between said first and second position, and at least one second biasing member, adapted to urge said damper element towards said second position, when between said third and second position.
Abstract:
Device for rotating a shaft between a starting position and a working position, preferably a rotary shaft (6; 28) of a fire damper (4; 50). The shaft (6; 28) can be rotated between the starting position and the working position by simultaneous actuation of a rotary motor (7; 36) and an electromagnet (13; 38) against the biassing force of a return spring (17; 52). The motor has an output shaft driven by a gear train and provided with a pinion (8; 32) which is in engagement with a toothed segment (5; 30), which, together with the return spring (17; 52) is mounted on the shaft (6; 28). By actuating the electromagnet (13; 38) and the motor (7; 36), the spring can be tensioned via the pinion (8; 32) and the toothed segment (5; 30) at the same time as the shaft (6; 28) is rotated to its working position. By means of a microprocessor (20) it is possible to individually control a monitor, via a two-wired loop, each of a group of fire dampers.
Abstract:
A direction-of-flow controller is provided for a diffuser of an air conditioner to control its diffused flow. This controller mainly consists of a curved bonded wall (3), a linear bonded wall (5) provided with a bias projection (4) upstream, and a controlling blade (6) rotating around a shaft (60) as a center. The blade (6) is composed of two surfaces (7), (8) having a biasing action and a curved surface (9), it effectively utilizes the attachment of the flow to the walls (3), (5) and the surface (9), thereby enabling a wide deflection and branching operation while decreasing the air flow rate hardly at all.
Abstract:
A damper Ia comprises a length of ducting (5) having a blade (3) is pivotably mounted in the ducting (5) by means of an axle (7) to which the blade (3) is fixed. The axle (7) passes through an opening (9) in a wall (11) of the ducting (5). A clutch housing (37a) is mounted on the outside of the ducting (5). Two spring clutches (39a,b) are mounted on a portion (33) of the axle (7) inside the clutch housing (37a). The spring clutches (39a,b) control a position of the axle (7) and the blade (3).
Abstract:
As shown generally as (1) in Figure 1, the gas pressure stabiliser comprises a frame (2) having an opening (3) bounded on its front side by a flange (4). Mounted within the frame (4) for movement about a longitudinal pivot axis A extending parallel to the plane of the opening (3) is a control member (5). Associated with the frame is a housing (12), which houses a control arm (13). When the control arm (13) is retracted into the housing or released, this controls pivoting of the counterbalancing means so that control member (5) can open or close to control venting of gas.